Annual report pursuant to Section 13 and 15(d)

Goodwill and intangible assets - Schedule of Finite-Lived Intangible Assets (Details)

v3.5.0.2
Goodwill and intangible assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Components of intangible assets    
Cost $ 143,675 $ 127,678
Accumulated Amortization 34,648 25,320
Intangible Assets, net 109,027 102,358
Customer contracts and relationships    
Components of intangible assets    
Cost 132,221 114,736
Accumulated Amortization 26,238 15,100
Intangible Assets, net 105,983 99,636
Technology-based intangible assets    
Components of intangible assets    
Cost 6,967 8,665
Accumulated Amortization 4,613 7,354
Intangible Assets, net 2,354 1,311
Trademarks and trade names    
Components of intangible assets    
Cost 4,487 4,277
Accumulated Amortization 3,797 2,866
Intangible Assets, net $ 690 $ 1,411
Weighted Average    
Components of intangible assets    
Weighted average remaining life of assets not fully amortized 13 years 1 month 6 days  
Weighted Average | Customer contracts and relationships    
Components of intangible assets    
Weighted average remaining life of assets not fully amortized 13 years 3 months 18 days  
Weighted Average | Technology-based intangible assets    
Components of intangible assets    
Weighted average remaining life of assets not fully amortized 5 years 6 months  
Weighted Average | Trademarks and trade names    
Components of intangible assets    
Weighted average remaining life of assets not fully amortized 1 year 2 months 12 days