Stockholders' Equity - Change in AOCL (Details) $ in Thousands	9 Months Ended
	Jun. 30, 2022 USD ($)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	$ 280,741
Balance	295,871
Interest rate caps
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(2,085)
Other comprehensive loss before reclassification, net of tax	1,073
Reclassification to net earnings, net of tax	1,255
Balance	243
Foreign exchange contracts
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(402)
Other comprehensive loss before reclassification, net of tax	400
Reclassification to net earnings, net of tax	188
Balance	186
Foreign currency translation adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(92,154)
Other comprehensive loss before reclassification, net of tax	(34,645)
Balance	(126,799)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(94,641)
Other comprehensive loss before reclassification, net of tax	(33,172)
Reclassification to net earnings, net of tax	1,443
Balance	$ (126,370)