Business Combinations - Business Acquisition, Pro Forma Adjustments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Adjustments to Net Revenues
Exalenz pre-acquisition revenues	$ 7,464	$ 13,599
Adjustments to Net Earnings
Exalenz pre-acquisition net loss	(6,423)	(4,006)
Pro forma adjustments:
Meridian acquisition-related costs	3,890	0
Exalenz transaction-related costs	4,550	0
Gain on Exalenz purchase price currency contracts	(845)	0
Expenses related to non-continuing personnel, locations or activities	(305)	1,441
Incremental depreciation and amortization	(1,680)	(3,027)
Incremental interest costs	(183)	(728)
Tax effects of pro forma adjustments	653	1,027
Total Adjustments to Net Earnings	$ (343)	$ (5,293)