Acquisitions (Additional Information) (Detail) - USD ($)		3 Months Ended	6 Months Ended
	May 31, 2019	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Cash paid for acquisition		$ 118,400,000
Long-term line of credit				$ 0
Proceeds from net working capital			$ 100,000
OnCourse Learning [Member]
Business Acquisition [Line Items]
Percentage of voting interests acquired	100.00%
Payments to acquire business	$ 118,300,000
Cash acquired from acquisition	1,200,000
Long-term line of credit	100,000,000
Intangible Assets	$ 63,100,000
Amortizable intangible assets, estimated useful lives	9 years
OnCourse Learning [Member] | Trade Name [Member]
Business Acquisition [Line Items]
Intangible Assets	$ 18,400,000