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Acquisitions (Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination) (Details) - SeaBear And Northport [Member]
$ in Thousands
12 Months Ended
Sep. 30, 2016
USD ($)
Developed Technologies [Member]  
Acquired Finite-Lived Intangible Assets [Line Items]  
Finite-lived Intangible Assets Acquired $ 6,131
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 7 years 7 months 6 days
Non-compete agreements [Member]  
Acquired Finite-Lived Intangible Assets [Line Items]  
Finite-lived Intangible Assets Acquired $ 575
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 5 years