Quarterly report pursuant to Section 13 or 15(d)

Business combinations and disposals Business combination and disposals Narrative (Details)

v3.7.0.1
Business combinations and disposals Business combination and disposals Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 18, 2017
USD ($)
May 09, 2016
USD ($)
Feb. 29, 2016
USD ($)
Dec. 15, 2015
USD ($)
company
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Sep. 30, 2016
USD ($)
Business Acquisition [Line Items]                  
Gain on sale of a business         $ 650 $ 6,453 $ 650 $ 6,453  
Goodwill         397,386   397,386   $ 397,558
Ascend Management Innovations LLC                  
Business Acquisition [Line Items]                  
Percentage of business acquired     100.00%            
Cash payment to acquire businesses     $ 44,100            
Estimated fair value of intangible assets acquired     $ 22,300   22,300   22,300    
Weighted average useful life (in years)     18 years            
Goodwill     $ 18,000   17,997   17,997    
Assessments Australia                  
Business Acquisition [Line Items]                  
Percentage of business acquired       100.00%          
Cash payment to acquire businesses       $ 2,600          
Contingent consideration arrangements, range of outcome, value, high       500          
Estimated fair value of intangible assets acquired       $ 400          
Number of businesses acquired | company       3          
Subsequent Event | Revitalised Limited [Member]                  
Business Acquisition [Line Items]                  
Percentage of business acquired 100.00%                
Cash payment to acquire businesses $ 2,800                
Contingent consideration arrangements, range of outcome, value, high $ 1,600                
K-12 Education [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]                  
Business Acquisition [Line Items]                  
Gain on sale of a business   $ 6,500             6,900
Related to Disposition of K-12 Education [Member] | K-12 Education [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]                  
Business Acquisition [Line Items]                  
Gain on sale of a business         700   700    
Human Services                  
Business Acquisition [Line Items]                  
Goodwill         $ 45,919   $ 45,919   $ 45,731
Human Services | Assessments Australia                  
Business Acquisition [Line Items]                  
Adjustment to goodwill acquired with Ascend       $ 3,000          
Customer relationships | Ascend Management Innovations LLC                  
Business Acquisition [Line Items]                  
Useful life             19 years    
Customer relationships | Assessments Australia                  
Business Acquisition [Line Items]                  
Useful life       6 years