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Summary of Significant Accounting Policies - Advertising Costs and AOCI (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Advertising Costs      
Advertising costs $ 3,200 $ 2,600 $ 2,700
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance 111,815 116,175 129,654
Current-period other comprehensive (loss) income 771 (1,809) (1,524)
Balance 135,015 111,815 116,175
Accumulated Other Comprehensive Loss      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance (9,782) (7,973) (6,449)
Balance (9,011) (9,782) (7,973)
Foreign Currency Translation Adjustments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance (8,085) (8,569) (7,585)
Current-period other comprehensive (loss) income 601 484 (984)
Balance (7,484) (8,085) (8,569)
Net Change Pension and Other Postretirement Benefit Plans      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance (1,697) 596 1,136
Current-period other comprehensive (loss) income 170 (2,293) (540)
Balance $ (1,527) $ (1,697) $ 596