Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net earnings	$ 240	$ 8,754	$ 15,831	$ 26,738
Other comprehensive income (loss):
Foreign currency translation adjustment	1,363	(1,563)	452	(2,479)
Unrealized gain (loss) on cash flow hedge	(164)	(417)	1,524	(1,111)
Income taxes related to items of other comprehensive income	39	228	(574)	522
Other comprehensive income (loss), net of tax	1,238	(1,752)	1,402	(3,068)
COMPREHENSIVE INCOME	$ 1,478	$ 7,002	$ 17,233	$ 23,670