Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net Earnings	$ 46,186	$ 24,382	$ 23,849
Other comprehensive income (loss):
Foreign currency translation adjustment	3,884	(802)	(1,075)
Unrealized gain (loss) on cash flow hedge	(713)	(1,159)	907
Reclassification of amortization of gain on cash flow hedge	(308)	(102)
Income taxes related to items of other comprehensive income	252	465	(263)
Other comprehensive income (loss), net of tax	3,115	(1,598)	(431)
Comprehensive Income	$ 49,301	$ 22,784	$ 23,418