Annual report pursuant to Section 13 and 15(d)

Business combinations and disposals - Acentia (Details)

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Business combinations and disposals - Acentia (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Apr. 01, 2015
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Preliminary Purchase Price Accounting          
Cash consideration, net of cash acquired     $ 2,677 $ 46,651 $ 289,212
Goodwill       $ 21,453  
Acentia          
Business Acquisition [Line Items]          
Share capital acquired (as a percent) 100.00%        
Goodwill, expected tax deductible amount $ 175,000        
Preliminary Purchase Price Accounting          
Cash consideration, net of cash acquired $ 293,500 $ 293,504      
Accounts receivable and unbilled receivables   35,333 35,333    
Other current assets   3,091 3,091    
Property and equipment   2,140 2,140    
Intangible assets   69,900 69,900    
Total identifiable assets acquired   110,464 110,464    
Accounts payable and other liabilities   31,350 31,350    
Deferred revenue   251 251    
Capital lease obligations   567 567    
Deferred tax liabilities   6,741 6,741    
Total liabilities assumed   38,909 38,909    
Net identifiable assets acquired   71,555 71,555    
Goodwill   221,949      
Net assets acquired   $ 293,504 $ 293,504    
Acentia | Customer relationships          
Business Acquisition [Line Items]          
Amortization period of intangible assets 14 years