Quarterly report pursuant to Section 13 or 15(d)

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

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Business combinations (Schedule of Assets and Liabilities Recorded in the Company's Financial Statements) (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Feb. 29, 2016
Apr. 01, 2015
Mar. 31, 2016
Mar. 31, 2015
Sep. 30, 2015
Business Acquisition [Line Items]          
Estimated purchase consideration, net of cash acquired     $ 41,812 $ 0  
Goodwill     401,152   $ 376,302
Ascend Management Innovations LLC          
Business Acquisition [Line Items]          
Cash, net of cash acquired     39,273    
Contingent consideration obligations     2,915    
Fair value of consideration     42,188    
Billed and unbilled receivables     4,069    
Other assets     251    
Property and equipment     660    
Intangible assets — customer relationships     22,300    
Total identifiable assets acquired     27,280    
Accounts payable and other liabilities     1,502    
Deferred revenue     0    
Total liabilities assumed     1,502    
Net identifiable assets acquired     25,778    
Goodwill     16,410    
Net assets acquired     42,188    
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    
Net assets acquired     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]          
Cash, net of cash acquired     2,569    
Contingent consideration obligations     110    
Fair value of consideration     2,679    
Billed and unbilled receivables     507    
Other assets     184    
Property and equipment     206    
Intangible assets — customer relationships     365    
Total identifiable assets acquired     1,262    
Accounts payable and other liabilities     674    
Deferred revenue     479    
Total liabilities assumed     1,153    
Net identifiable assets acquired     109    
Goodwill     2,570    
Net assets acquired     2,679    
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
Net assets acquired         $ 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    
Net assets acquired     $ 0