Quarterly report pursuant to Section 13 or 15(d)

Business combinations (Schedule of the Valuation of the Intangible Assets Acquired) (Details)

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Business combinations (Schedule of the Valuation of the Intangible Assets Acquired) (Details) - Ascend Management Innovations LLC
$ in Thousands
 6 Months Ended
Mar. 31, 2017
USD ($)
Business Acquisition [Line Items]  
Finite-lived intangible assets acquired $ 22,300
Customer relationships  
Business Acquisition [Line Items]  
Finite-lived intangible asset, useful life 19 years
Finite-lived intangible assets acquired $ 20,400
Trade Names  
Business Acquisition [Line Items]  
Finite-lived intangible asset, useful life 8 years
Finite-lived intangible assets acquired $ 1,700
Technology-Based Intangible Assets  
Business Acquisition [Line Items]  
Finite-lived intangible asset, useful life 1 year
Finite-lived intangible assets acquired $ 200