Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Allowance for Doubtful Accounts) (Details)

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Summary of Significant Accounting Policies (Allowance for Doubtful Accounts) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balance at beginning of year $ 5,009 $ 2,846 $ 638
Provision / (Reversal) 1,698 (194) 1,304
Write offs (1,942) (130) (13)
Acquired through business acquisitions 0 1,397 0
Adjustment (1,035) 1,090 917
Balance at end of year $ 3,730 $ 5,009 $ 2,846