Stockholders' Equity - Change in AOCL (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2022 USD ($)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	$ 280,741
Balance	271,866
Interest rate caps
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(2,085)
Other comprehensive loss before reclassification, net of tax	(114)
Reclassification to net earnings, net of tax	392
Balance	(1,807)
Foreign exchange contracts
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(402)
Other comprehensive loss before reclassification, net of tax	(212)
Reclassification to net earnings, net of tax	368
Balance	(246)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(92,154)
Other comprehensive loss before reclassification, net of tax	(7,261)
Balance	(99,415)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(94,641)
Other comprehensive loss before reclassification, net of tax	(7,587)
Reclassification to net earnings, net of tax	760
Balance	$ (101,468)