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Revenue (Disaggregate revenue) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 1,112,380	$ 1,052,001	$ 1,013,843
Higher Education [Member]
Disaggregation of Revenue [Line Items]
Revenue	903,626	848,154	835,908
Test Preparation/Certifications [Member]
Disaggregation of Revenue [Line Items]
Revenue	131,823	108,471	116,096
Conferences/Seminars [Member]
Disaggregation of Revenue [Line Items]
Revenue	28,547	43,147	27,794
Memberships/Subscriptions [Member]
Disaggregation of Revenue [Line Items]
Revenue	45,109	33,955	20,092
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	3,275	18,274	13,953
Medical and Healthcare [Member]
Disaggregation of Revenue [Line Items]
Revenue	906,901	866,428	849,861
Medical and Healthcare [Member] | Higher Education [Member]
Disaggregation of Revenue [Line Items]
Revenue	903,626	848,154	835,908
Medical and Healthcare [Member] | Test Preparation/Certifications [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0
Medical and Healthcare [Member] | Conferences/Seminars [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0
Medical and Healthcare [Member] | Memberships/Subscriptions [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0
Medical and Healthcare [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	3,275	18,274	13,953
Financial Services [Member]
Disaggregation of Revenue [Line Items]
Revenue			167,211
Financial Services [Member] | Test Preparation/Certifications [Member]
Disaggregation of Revenue [Line Items]
Revenue			119,325
Financial Services [Member] | Conferences/Seminars [Member]
Disaggregation of Revenue [Line Items]
Revenue			27,794
Financial Services [Member] | Memberships/Subscriptions [Member]
Disaggregation of Revenue [Line Items]
Revenue			20,092
Financial Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	205,479	185,573
Financial Services [Member] | Higher Education [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0
Financial Services [Member] | Test Preparation/Certifications [Member]
Disaggregation of Revenue [Line Items]
Revenue	131,823	108,471
Financial Services [Member] | Conferences/Seminars [Member]
Disaggregation of Revenue [Line Items]
Revenue	28,547	43,147
Financial Services [Member] | Memberships/Subscriptions [Member]
Disaggregation of Revenue [Line Items]
Revenue	45,109	33,955
Financial Services [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0
Home Office And Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0	(3,229)
Home Office And Other [Member] | Higher Education [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0
Home Office And Other [Member] | Test Preparation/Certifications [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0	$ (3,229)
Home Office And Other [Member] | Conferences/Seminars [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0
Home Office And Other [Member] | Memberships/Subscriptions [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0
Home Office And Other [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 0	$ 0

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