Annual report pursuant to Section 13 and 15(d)

Goodwill and intangible assets - Schedule of Goodwill (Details)

v3.10.0.1
Goodwill and intangible assets - Schedule of Goodwill (Details) - USD ($)
12 Months Ended
Jul. 01, 2018
Sep. 30, 2018
Sep. 30, 2017
Changes in goodwill      
Balance at the beginning of the period   $ 402,976,000 $ 397,558,000
Foreign currency translation   (3,094,000) 3,074,000
Balance at the end of the period   399,882,000 402,976,000
Impairment of goodwill related to continuing operations $ 0 0  
Ascend Management Innovations LLC      
Changes in goodwill      
Balance at the end of the period   17,997,000  
Ascend Management Innovations LLC and Assessments Australia      
Changes in goodwill      
Adjustment to goodwill acquired     (486,000)
Revitalised      
Changes in goodwill      
Goodwill, Acquired During Period     2,830,000
Health Services      
Changes in goodwill      
Balance at the beginning of the period   128,460,000 123,679,000
Foreign currency translation   (1,719,000) 2,508,000
Balance at the end of the period   126,741,000 128,460,000
Health Services | Ascend Management Innovations LLC      
Changes in goodwill      
Adjustment to goodwill acquired     (557,000)
Health Services | Revitalised      
Changes in goodwill      
Goodwill, Acquired During Period     2,830,000
U.S. Federal Services      
Changes in goodwill      
Balance at the beginning of the period   228,148,000 228,148,000
Adjustment to goodwill acquired     0
Foreign currency translation   0 0
Balance at the end of the period   228,148,000 228,148,000
U.S. Federal Services | Revitalised      
Changes in goodwill      
Goodwill, Acquired During Period     0
Human Services      
Changes in goodwill      
Balance at the beginning of the period   46,368,000 45,731,000
Foreign currency translation   (1,375,000) 566,000
Balance at the end of the period   $ 44,993,000 46,368,000
Human Services | Assessments Australia      
Changes in goodwill      
Adjustment to goodwill acquired     71,000
Human Services | Revitalised      
Changes in goodwill      
Goodwill, Acquired During Period     $ 0