v3.24.3
Shareholder Report, Line Graph (Details) - USD ($)
 12 Months Ended 60 Months Ended 120 Months Ended
Jul. 31, 2024
Jul. 31, 2024
Jul. 31, 2024
Jul. 31, 2023
Jul. 31, 2022
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2014
C000100841 [Member]                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Fundamental All Cap Core Fund (Class A/JFCAX)                        
Account Value $ 33,239.1439 $ 33,239.1439 $ 33,239.1439 $ 26,681.62773 $ 23,405.84553 $ 25,803.87441 $ 17,972.38137 $ 15,487.26375 $ 15,094.7057 $ 12,885.68875 $ 10,731.3926 $ 10,998.17432 $ 9,500
Average Annual Return, Percent 18.33% 15.32% 12.77%                    
C000100841 [Member] | Without Sales Load [Member]                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Fundamental All Cap Core Fund (Class A/JFCAX)—excluding sales charge                        
Average Annual Return, Percent 24.58% 16.50% 13.34%                    
C000100842 [Member]                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Fundamental All Cap Core Fund (Class C/JFCCX)                        
Account Value $ 32,656.88432 $ 32,656.88432 $ 32,656.88432 26,400.05216 23,323.58809 25,882.004 18,161.50857 15,757.0023 15,462.74017 13,300.83176 11,148.00898 11,508.8798 10,000
Average Annual Return, Percent 22.70% 15.69% 12.56%                    
C000100842 [Member] | Without Sales Load [Member]                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Fundamental All Cap Core Fund (Class C/JFCCX)—excluding sales charge                        
Average Annual Return, Percent 23.70% 15.69% 12.56%                    
C000100843 [Member]                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Fundamental All Cap Core Fund (Class I/JFCIX)                        
Account Value $ 902,060.6687 $ 902,060.6687 $ 902,060.6687 721,950.1542 631,466.913 693,901.3915 481,981.2457 414,270.5582 402,441.8974 342,507.4387 284,473.4709 290,503.5875 250,000
Average Annual Return, Percent 24.95% 16.84% 13.69%                    
C000153970 [Member]                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Fundamental All Cap Core Fund (Class R2/JFACX)                        
Account Value $ 34,915.6224 $ 34,915.6224 $ 34,915.6224 28,046.15913 24,624.82206 27,165.05666 18,949.52247 16,345.1689 15,942.23139 13,615.84802 11,322.65384 11,587.0325 10,000
Average Annual Return, Percent 24.49% 16.39% 13.32%                    
C000100846 [Member]                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Fundamental All Cap Core Fund (Class R4/JFARX)                        
Account Value $ 35,765.66718 $ 35,765.66718 $ 35,765.66718 28,645.95762 25,066.09293 27,564.46491 19,152.01387 16,465.47205 16,010.20397 13,648.19436 11,334.18278 11,594.1586 10,000
Average Annual Return, Percent 24.85% 16.78% 13.59%                    
C000153971 [Member]                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Fundamental All Cap Core Fund (Class R6/JFAIX)                        
Account Value $ 3,635,024.976 $ 3,635,024.976 $ 3,635,024.976 2,905,688.433 2,538,951.268 2,786,846.259 1,933,633.428 1,659,972.474 1,610,952.948 1,369,628.571 1,135,774.81 1,160,128.47 1,000,000
Average Annual Return, Percent 25.10% 16.97% 13.78%                    
C000107909 [Member]                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Multi-Asset Absolute Return Fund (Class A/JHAAX)                        
Account Value $ 11,571.06858 $ 11,571.06858 $ 11,571.06858 11,214.50485 11,066.13204 11,277.87068 10,045.17895 9,957.043682 9,560.273406 9,730.317813 9,390.22907 9,989.088405 9,500
Average Annual Return, Percent (1.95%) 2.01% 1.47%                    
C000107909 [Member] | Without Sales Load [Member]                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Multi-Asset Absolute Return Fund (Class A/JHAAX)—excluding sales charge                        
Average Annual Return, Percent 3.18% 3.05% 1.99%                    
C000107910 [Member]                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Multi-Asset Absolute Return Fund (Class C/JHACX)                        
Account Value $ 11,364.56939 $ 11,364.56939 $ 11,364.56939 11,093.1414 11,024.16278 11,311.8497 10,149.59456 10,126.58988 9,791.989283 10,028.17794 9,752.624464 10,442.5977 10,000
Average Annual Return, Percent 1.45% 2.33% 1.29%                    
C000107910 [Member] | Without Sales Load [Member]                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Multi-Asset Absolute Return Fund (Class C/JHACX)—excluding sales charge                        
Average Annual Return, Percent 2.45% 2.33% 1.29%                    
C000107911 [Member]                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Multi-Asset Absolute Return Fund (Class I/JHAIX)                        
Account Value $ 313,754.3928 $ 313,754.3928 $ 313,754.3928 303,367.197 298,202.019 303,221.2617 269,196.1593 265,951.7186 254,735.3858 258,224.9108 248,504.0893 263,445.4675 250,000
Average Annual Return, Percent 3.42% 3.36% 2.30%                    
C000107912 [Member]                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Multi-Asset Absolute Return Fund (Class NAV)                        
Account Value $ 12,702.22248 $ 12,702.22248 $ 12,702.22248 12,259.5507 12,050.28959 12,228.37272 10,847.68434 10,704.42784 10,234.23339 10,374.2913 9,964.121618 10,550.634 10,000
Average Annual Return, Percent 3.61% 3.48% 2.42%                    
C000113522 [Member]                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Multi-Asset Absolute Return Fund (Class R2/JHARX)                        
Account Value $ 12,075.22464 $ 12,075.22464 $ 12,075.22464 11,700.89272 11,546.64467 11,780.6192 10,489.66896 10,404.16142 9,997.516442 10,185.96173 9,838.825718 10,475.3114 10,000
Average Annual Return, Percent 3.20% 3.02% 1.90%                    
C000107913 [Member]                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Multi-Asset Absolute Return Fund (Class R6/JHASX)                        
Account Value $ 1,267,594.495 $ 1,267,594.495 $ 1,267,594.495 1,224,604.367 1,203,701.311 1,222,675.909 1,084,862.255 1,070,476.19 1,023,499.174 1,037,492.331 996,512.3837 1,055,115.47 1,000,000
Average Annual Return, Percent 3.51% 3.44% 2.40%                    
Russell 3000 Index [Member]                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Russell 3000 Index                        
Account Value $ 32,705.048 $ 32,705.048 $ 32,705.048 27,012.50976 23,979.31234 25,881.99149 18,657.03668 16,818.80231 15,711.16971 13,498.43231 11,623.05235 11,128.4052 10,000
Average Annual Return, Percent 21.07% 14.23% 12.58%                    
Bloomberg U S Aggregate Bond Index [Member]                          
Account Value [Line Items]                          
Line Graph and Table Measure Name Bloomberg U.S. Aggregate Bond Index                        
Account Value $ 11,726.77709 $ 11,726.77709 $ 11,726.77709 11,157.61881 11,546.49949 12,704.70387 12,794.49074 11,618.54271 10,749.85718 10,836.603 10,892.65409 10,282.3909 10,000
Average Annual Return, Percent 5.10% 0.19% 1.61%                    
ICE BofA 0 3 Month U S Treasury Bill Index [Member]                          
Account Value [Line Items]                          
Line Graph and Table Measure Name ICE BofA 0-3 Month U.S. Treasury Bill Index                        
Account Value $ 11,648.29162 $ 11,648.29162 $ 11,648.29162 11,041.3557 10,609.77111 10,582.32901 10,575.16085 10,439.28768 10,203.86333 10,065.26195 10,016.262 10,000.9094 10,000
Average Annual Return, Percent 5.50% 2.22% 1.54%                    
Seventy Bloomberg Global Aggregate Bond USD Hedged Index 30 MSCI All Country World Index [Member]                          
Account Value [Line Items]                          
Line Graph and Table Measure Name 70% Bloomberg Global Aggregate Bond USD Hedged Index / 30% MSCI All Country World Index                        
Account Value $ 15,268.51788 $ 15,268.51788 $ 15,268.51788 $ 13,952.6198 $ 13,612.99504 $ 14,859.74649 $ 13,578.62743 $ 12,676.28012 $ 11,825.65949 $ 11,344.56921 $ 10,868.79905 $ 10,356.6403 $ 10,000
Average Annual Return, Percent 9.43% 3.79% 4.32%