Revenue (Disaggregate revenue) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 283,111	$ 266,172	$ 551,352	$ 520,785
Higher Education [Member]
Disaggregation of Revenue [Line Items]
Revenue	234,144	214,153	452,433	415,606
Test Preparation/Certifications [Member]
Disaggregation of Revenue [Line Items]
Revenue	31,900	26,938	59,176	51,909
Conferences/Seminars [Member]
Disaggregation of Revenue [Line Items]
Revenue	8,178	13,742	21,547	30,814
Memberships/Subscriptions [Member]
Disaggregation of Revenue [Line Items]
Revenue	7,798	5,055	15,793	9,922
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,091	6,284	2,403	12,534
Medical and Healthcare [Member]
Disaggregation of Revenue [Line Items]
Revenue	234,396	220,180	453,222	427,667
Medical and Healthcare [Member] | Higher Education [Member]
Disaggregation of Revenue [Line Items]
Revenue	234,144	214,153	452,433	415,606
Medical and Healthcare [Member] | Test Preparation/Certifications [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Medical and Healthcare [Member] | Conferences/Seminars [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Medical and Healthcare [Member] | Memberships/Subscriptions [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Medical and Healthcare [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	252	6,027	789	12,061
Financial Services [Member]
Disaggregation of Revenue [Line Items]
Revenue	48,715	45,992	98,130	93,118
Financial Services [Member] | Higher Education [Member]
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Financial Services [Member] | Test Preparation/Certifications [Member]
Disaggregation of Revenue [Line Items]
Revenue	31,900	26,938	59,176	51,909
Financial Services [Member] | Conferences/Seminars [Member]
Disaggregation of Revenue [Line Items]
Revenue	8,178	13,742	21,547	30,814
Financial Services [Member] | Memberships/Subscriptions [Member]
Disaggregation of Revenue [Line Items]
Revenue	7,798	5,055	15,793	9,922
Financial Services [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 839	$ 257	$ 1,614	$ 473