Revenue Recognition (Tables)

12 Months Ended

Sep. 30, 2021

Revenue Recognition [Abstract]

Schedule of Contract Assets and Contract Liabilities

The following table summarizes the balances of the Company's unbilled receivables (contract assets), which are reported in Other current assets, and its customer advances (contract liabilities), which are reported in Accrued expenses.     

	2020		2021
Unbilled receivables (contract assets)	$	458	528
Customer advances (contract liabilities)	(583)		(730)
Net contract liabilities	$	(125)	(202)