v3.25.2
Subsequent Events (Unaudited) (FY) (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
MW
shares
Mar. 31, 2025
USD ($)
MW
shares
Mar. 31, 2025
USD ($)
MW
shares
Jun. 30, 2025
USD ($)
MW
shares
Dec. 31, 2024
USD ($)
shares
Aug. 12, 2025
USD ($)
Feb. 28, 2025
USD ($)
MW
Jan. 31, 2025
USD ($)
Aug. 31, 2024
MW
Dec. 31, 2023
USD ($)
Subsequent Event [Line Items]                    
Issuance of common stock for contract incentive     $ 350,000              
Lease liability       $ 3,447,472 $ 2,602,016         $ 472,442
Electrical power access | MW       135         50  
Lease not yet commenced term         17 years          
Restricted Stock Units (RSUs)                    
Subsequent Event [Line Items]                    
Shares granted (in shares) | shares       13,188,000 15,733,000          
Unrecognized compensation costs       $ 1,100,000            
2025 Plan | Stock Options                    
Subsequent Event [Line Items]                    
Shares reserved for future issuance (in shares) | shares 50,000,000 50,000,000 50,000,000              
2025 Employee Stock Purchase Plan | Employee Stock                    
Subsequent Event [Line Items]                    
Number of shares authorized (in shares) | shares       10,000,000,000,000            
Single Site, Data Center                    
Subsequent Event [Line Items]                    
Electrical power access | MW       133            
Lease not yet commenced term       15 years            
Single Site, Data Center | Minimum                    
Subsequent Event [Line Items]                    
Lease not yet commenced, liability       $ 3,800,000            
Single Site, Data Center | Maximum                    
Subsequent Event [Line Items]                    
Lease not yet commenced, liability       4,800,000            
OEM Financing Arrangements                    
Subsequent Event [Line Items]                    
Principal amount       $ 2,200,000 $ 1,300,000          
OEM Financing Arrangements | Minimum                    
Subsequent Event [Line Items]                    
Term       2 years 2 years          
OEM Financing Arrangements | Maximum                    
Subsequent Event [Line Items]                    
Term       3 years 3 years          
Common Class A                    
Subsequent Event [Line Items]                    
Issuance of common stock for contract incentive $ 350,000     $ 350,000            
OpenAI OpCo, LLC                    
Subsequent Event [Line Items]                    
Contract with customer, asset       $ 11,900,000            
Subsequent Event                    
Subsequent Event [Line Items]                    
Lease liability $ 3,400,000 $ 3,400,000 $ 3,400,000     $ 11,900,000 $ 1,700,000      
Term of contract 15 years 15 years 15 years       13 years      
Electrical power access | MW             70      
Subsequent Event | Restricted Stock Units (RSUs)                    
Subsequent Event [Line Items]                    
Shares granted (in shares) | shares     8,753,320              
Unrecognized compensation costs $ 450,000 $ 450,000 $ 450,000              
Subsequent Event | 2025 Plan | Stock Options                    
Subsequent Event [Line Items]                    
Shares reserved for future issuance (in shares) | shares 50,000,000 50,000,000 50,000,000              
Subsequent Event | 2025 Employee Stock Purchase Plan | Employee Stock                    
Subsequent Event [Line Items]                    
Number of shares authorized (in shares) | shares 10,000,000 10,000,000 10,000,000              
Subsequent Event | Additional Space                    
Subsequent Event [Line Items]                    
Lease liability $ 497,000 $ 497,000 $ 497,000              
Term of contract 12 years 12 years 12 years              
Subsequent Event | Single Site, Data Center                    
Subsequent Event [Line Items]                    
Electrical power access | MW 133 133 133              
Lease not yet commenced term 15 years 15 years 15 years              
Subsequent Event | Single Site, Data Center | Minimum                    
Subsequent Event [Line Items]                    
Lease not yet commenced, liability $ 3,800,000 $ 3,800,000 $ 3,800,000              
Subsequent Event | Single Site, Data Center | Maximum                    
Subsequent Event [Line Items]                    
Lease not yet commenced, liability 4,800,000 $ 4,800,000 4,800,000              
Subsequent Event | Base Rate                    
Subsequent Event [Line Items]                    
Floor interest rate   1.00%                
Subsequent Event | OEM Financing Arrangements                    
Subsequent Event [Line Items]                    
Principal amount $ 41,000 $ 41,000 $ 41,000         $ 160,000    
Term 2 years 2 years 2 years              
Subsequent Event | Line of Credit | 2025 Term Loan Facility | Base Rate                    
Subsequent Event [Line Items]                    
Basis spread on variable rate   0.75%                
Subsequent Event | Line of Credit | 2025 Term Loan Facility | Overnight Bank Funding Rate                    
Subsequent Event [Line Items]                    
Basis spread on variable rate   0.50%                
Subsequent Event | Line of Credit | 2025 Term Loan Facility | Secured Overnight Financing Rate (SOFR)                    
Subsequent Event [Line Items]                    
Basis spread on variable rate   1.00%                
Term of variable rate   1 month                
Subsequent Event | Line of Credit | 2025 Term Loan Facility | Unsecured Debt                    
Subsequent Event [Line Items]                    
Maximum borrowing capacity $ 300,000 $ 300,000 $ 300,000              
Borrowings   $ 0                
Maturity date   Dec. 16, 2025                
Fee payable to lenders   2.25%                
Subsequent Event | Line of Credit | 2025 Term Loan Facility | Term Benchmark Loan | Secured Overnight Financing Rate (SOFR)                    
Subsequent Event [Line Items]                    
Basis spread on variable rate   1.75%                
Floor interest rate   0.00%                
Subsequent Event | Common Class A                    
Subsequent Event [Line Items]                    
Issuance of common stock for contract incentive   $ 350,000                
Subsequent Event | OpenAI OpCo, LLC                    
Subsequent Event [Line Items]                    
Contract with customer, asset $ 11,900,000 $ 11,900,000 $ 11,900,000