Revenues (Disaggregate revenue) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 266,172	$ 253,961	$ 520,785	$ 490,900
Higher Education [Member]
Disaggregation of Revenue [Line Items]
Revenues	214,153	211,487	415,606	412,660
Test Preparation/Certifications
Disaggregation of Revenue [Line Items]
Revenues	26,938	26,491	51,909	54,400
Conferences Seminars [Member]
Disaggregation of Revenue [Line Items]
Revenues	13,742	10,676	30,814	13,544
Memberships Subscriptions [Member]
Disaggregation of Revenue [Line Items]
Revenues	5,055	3,900	9,922	7,836
Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	6,284	1,407	12,534	2,460
Medical and Healthcare [Member]
Disaggregation of Revenue [Line Items]
Revenues	220,180	212,627	427,667	414,727
Medical and Healthcare [Member] | Higher Education [Member]
Disaggregation of Revenue [Line Items]
Revenues	214,153	211,487	415,606	412,660
Medical and Healthcare [Member] | Test Preparation/Certifications
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	6,027	1,140	12,061	2,067
Financial Services [Member]
Disaggregation of Revenue [Line Items]
Revenues	45,992	42,142	93,118	77,788
Financial Services [Member] | Higher Education [Member]
Disaggregation of Revenue [Line Items]
Revenues		0		0
Financial Services [Member] | Test Preparation/Certifications
Disaggregation of Revenue [Line Items]
Revenues	26,938	27,299	51,909	56,015
Financial Services [Member] | Conferences Seminars [Member]
Disaggregation of Revenue [Line Items]
Revenues	13,742	10,676	30,814	13,544
Financial Services [Member] | Memberships Subscriptions [Member]
Disaggregation of Revenue [Line Items]
Revenues	5,055	3,900	9,922	7,836
Financial Services [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 257	267	473	393
Home Office And Other [Member]
Disaggregation of Revenue [Line Items]
Revenues		(808)	$ 0	(1,615)
Home Office And Other [Member] | Higher Education [Member]
Disaggregation of Revenue [Line Items]
Revenues		0		0
Home Office And Other [Member] | Test Preparation/Certifications
Disaggregation of Revenue [Line Items]
Revenues		(808)		(1,615)
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