Supplementary Balance Sheet Information - Summary of Account Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]
Accounts receivable	$ 124,195	$ 101,937
Less allowance for expected credit losses	(4,318)	(7,146)
Accounts receivable, net	$ 119,877	$ 94,791

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant