Quarterly report pursuant to Section 13 or 15(d)

Business combinations and disposals (Schedule of Assets and Liabilities Recorded in the Company's Financial Statements) (Details)

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Business combinations and disposals (Schedule of Assets and Liabilities Recorded in the Company's Financial Statements) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Feb. 29, 2016
Apr. 01, 2015
Jun. 30, 2016
Jun. 30, 2015
Sep. 30, 2015
Dec. 15, 2015
Business Acquisition [Line Items]            
Estimated purchase consideration, net of cash acquired     $ 46,736 $ 289,612    
Goodwill     398,929   $ 376,302  
Ascend Management Innovations LLC            
Business Acquisition [Line Items]            
Fair value of consideration     44,000      
Billed and unbilled receivables     4,069      
Other assets     407      
Property and equipment     707      
Intangible assets — customer relationships $ 22,300   22,300      
Total identifiable assets acquired     27,483      
Accounts payable and other liabilities     1,414      
Deferred revenue     554      
Total liabilities assumed     1,968      
Net identifiable assets acquired     25,515      
Goodwill $ 18,500   18,495      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net     44,010      
Amortization period of intangible assets (in years) 18 years          
Acentia LLC            
Business Acquisition [Line Items]            
Estimated purchase consideration, net of cash acquired   $ 293,500 293,504      
Billed and unbilled receivables     35,333      
Other assets     3,091      
Property and equipment     2,140      
Intangible assets — customer relationships     69,900      
Total identifiable assets acquired     110,464      
Accounts payable and other liabilities     31,350      
Deferred revenue     251      
Capital lease obligations     567      
Deferred tax liabilities     6,741      
Total liabilities assumed     38,909      
Net identifiable assets acquired     71,555      
Goodwill     221,949      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net     293,504      
Percentage of goodwill anticipated to be deductible for tax purpose   $ 175,000        
Acentia LLC | Customer relationships            
Business Acquisition [Line Items]            
Amortization period of intangible assets (in years)   14 years        
Assessments Australia            
Business Acquisition [Line Items]            
Intangible assets — customer relationships           $ 400
Previously Reported | Acentia LLC            
Business Acquisition [Line Items]            
Estimated purchase consideration, net of cash acquired         293,504  
Billed and unbilled receivables         35,333  
Other assets         5,050  
Property and equipment         2,140  
Intangible assets — customer relationships         69,900  
Total identifiable assets acquired         112,423  
Accounts payable and other liabilities         32,426  
Deferred revenue         251  
Capital lease obligations         567  
Deferred tax liabilities         0  
Total liabilities assumed         33,244  
Net identifiable assets acquired         79,179  
Goodwill         214,325  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net         $ 293,504  
Purchase Accounting Adjustment | Acentia LLC            
Business Acquisition [Line Items]            
Estimated purchase consideration, net of cash acquired     0      
Other assets     (1,959)      
Total identifiable assets acquired     (1,959)      
Accounts payable and other liabilities     (1,076)      
Deferred tax liabilities     6,741      
Total liabilities assumed     5,665      
Net identifiable assets acquired     (7,624)      
Goodwill     7,624      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net     $ 0