Revenues (Disaggregate revenue) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 259,729	$ 271,487	$ 266,172	$ 254,613	$ 264,240	$ 258,703	$ 253,961	$ 236,939	$ 1,052,001	$ 1,013,843	$ 960,277
Higher Education [Member]
Disaggregation of Revenue [Line Items]
Revenues									848,154	835,908	815,674
Test Preparation/Certifications [Member]
Disaggregation of Revenue [Line Items]
Revenues									108,965	116,085	107,886
Conferences Seminars [Member]
Disaggregation of Revenue [Line Items]
Revenues									52,498	30,452	21,997
Memberships Subscriptions [Member]
Disaggregation of Revenue [Line Items]
Revenues									22,945	16,574	13,728
Other [Member]
Disaggregation of Revenue [Line Items]
Revenues									19,439	14,824	992
Medical and Healthcare [Member]
Disaggregation of Revenue [Line Items]
Revenues									866,428	849,861	815,674
Medical and Healthcare [Member] \| Higher Education [Member]
Disaggregation of Revenue [Line Items]
Revenues									848,154	835,908	815,674
Medical and Healthcare [Member] \| Test Preparation/Certifications [Member]
Disaggregation of Revenue [Line Items]
Revenues									0	0
Medical and Healthcare [Member] \| Conferences Seminars [Member]
Disaggregation of Revenue [Line Items]
Revenues									0	0
Medical and Healthcare [Member] \| Memberships Subscriptions [Member]
Disaggregation of Revenue [Line Items]
Revenues									0	0
Medical and Healthcare [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenues									18,274	13,953
Financial Services [Member]
Disaggregation of Revenue [Line Items]
Revenues											147,195
Financial Services [Member] \| Test Preparation/Certifications [Member]
Disaggregation of Revenue [Line Items]
Revenues											110,478
Financial Services [Member] \| Conferences Seminars [Member]
Disaggregation of Revenue [Line Items]
Revenues											21,997
Financial Services [Member] \| Memberships Subscriptions [Member]
Disaggregation of Revenue [Line Items]
Revenues											13,728
Financial Services [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenues											992
Financial Services
Disaggregation of Revenue [Line Items]
Revenues									185,573	167,211
Financial Services \| Higher Education [Member]
Disaggregation of Revenue [Line Items]
Revenues									0	0
Financial Services \| Test Preparation/Certifications [Member]
Disaggregation of Revenue [Line Items]
Revenues									108,965	119,314
Financial Services \| Conferences Seminars [Member]
Disaggregation of Revenue [Line Items]
Revenues									52,498	30,452
Financial Services \| Memberships Subscriptions [Member]
Disaggregation of Revenue [Line Items]
Revenues									22,945	16,574
Financial Services \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenues									1,165	871
Home Office And Other [Member]
Disaggregation of Revenue [Line Items]
Revenues									0	(3,229)	(2,592)
Home Office And Other [Member] \| Higher Education [Member]
Disaggregation of Revenue [Line Items]
Revenues									0	0
Home Office And Other [Member] \| Test Preparation/Certifications [Member]
Disaggregation of Revenue [Line Items]
Revenues									0	(3,229)	$ (2,592)
Home Office And Other [Member] \| Conferences Seminars [Member]
Disaggregation of Revenue [Line Items]
Revenues									0	0
Home Office And Other [Member] \| Memberships Subscriptions [Member]
Disaggregation of Revenue [Line Items]
Revenues									0	0
Home Office And Other [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 0	$ 0