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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

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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