Annual report pursuant to Section 13 and 15(d)

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

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Business combinations and disposals - Schedule of the Valuation of the Intangible Assets Acquired (Details) - Ascend Management Innovations LLC - USD ($)
$ in Thousands
12 Months Ended
Feb. 29, 2016
Sep. 30, 2018
Components of intangible assets    
Fair value $ 22,300  
Customer relationships    
Components of intangible assets    
Useful life   19 years
Fair value 20,400  
Technology-Based Intangible Assets    
Components of intangible assets    
Useful life   8 years
Fair value 1,700  
Trade Names    
Components of intangible assets    
Useful life   1 year
Fair value $ 200