v3.24.3
Income Taxes - Deferred tax assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Deferred tax assets attributable to:      
Foreign loss carryforwards $ 28,713 $ 32,435  
U.S. foreign tax credits 13,279 12,913  
Accrued liabilities 10,604 17,672  
Share-based compensation expense 8,323 7,430  
Other (785) (2,937)  
Total deferred tax assets 60,134 67,513  
Valuation allowance (34,298) (35,912)  
Total deferred tax assets, net 25,836 31,601  
Deferred tax liabilities attributable to:      
Depreciation and amortization 95,377 101,957  
Inventory adjustments 418 1,452  
Total deferred tax liabilities 95,795 103,409  
Net deferred tax liability 69,959 71,808  
Valuation allowances decreased (1,600)    
Domestic earnings before provision for income taxes 175,200 217,700 $ 205,200
Foreign earnings before provision for income (loss) taxes 31,100 34,400 $ 38,900
Total operating loss carry-forward 106,600 119,400  
Operating loss carry-forward, subject to valuation allowance 52,500 62,700  
Amount of operating loss carry-forwards without an expiration date 106,600    
Total tax credit carryforwards 15,200 15,500  
Expiring tax credit carryforwards 300    
Expiring tax credit carryforwards 300    
Non-expiring tax credit carryforwards 1,300    
Total Tax credit carryforwards, subject to a valuation allowance 14,800 $ 14,200  
U.S. foreign      
Deferred tax liabilities attributable to:      
Expiring tax credit carryforwards $ 13,300