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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Statement of Comprehensive Income [Abstract]        
Net (loss) income $ (23,689) $ 15,387 $ (1,894) $ 2,999
Other comprehensive income (loss) ("OCI"), net of tax:        
Foreign currency translation adjustment (665) 98,801 23,005 92,542
Pension plans and other postretirement benefits (217) 44 (1,812) (378)
Unrecognized gain (loss) on cash flow hedges:        
Net change from periodic revaluation 990 (1,195) 1,811 (408)
Net amount reclassified to earnings 56 (204) (76) (742)
Net change in unrecognized gain (loss) on cash flow hedges 1,046 (1,399) 1,735 (1,150)
OCI, net of tax 164 97,446 22,928 91,014
Comprehensive (loss) income $ (23,525) $ 112,833 $ 21,034 $ 94,013