Goodwill and Other Identifiable Intangible Assets, Net (Goodwill Rollforward) (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Goodwill [Roll Forward]
Beginning balance	$ 109,448	$ 100,183
Acquisitions	21,434	10,985
Foreign currency translation adjustment	187	(1,288)
Ending balance	$ 131,069	$ 109,880