Acquisition (Details) - USD ($) $ in Thousands		9 Months Ended
	Oct. 05, 2015	Jun. 30, 2016	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2014
Business Acquisition [Line Items]
Goodwill		$ 109,880	$ 100,183	$ 100,583	$ 101,484
Bluenica Corporation
Business Acquisition [Line Items]
Cash paid at closing	$ 2,888
Earn-out payment installment period	4 years
Fair value of contingent consideration	$ 10,400
Acquisition costs		$ 100
Goodwill	$ 10,985
Weighted average use life of acquired intangibles	5 years 7 months 13 days
Purchased and Core Technology | Bluenica Corporation
Business Acquisition [Line Items]
Useful life of finite lived intangibles	5 years
Customer Relationships | Bluenica Corporation
Business Acquisition [Line Items]
Useful life of finite lived intangibles	7 years
Earn-out payments | Bluenica Corporation
Business Acquisition [Line Items]
Earn-out payment maximum	$ 11,600
Additional earn-out payment | Bluenica Corporation
Business Acquisition [Line Items]
Earn-out payment maximum	$ 3,500