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Preferred and Common Stockholder's Equity - Additional Information (Detail) - USD ($)	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2017		Jun. 30, 2018	Jun. 30, 2016
Class of Stock [Line Items]
Preferred stock, shares authorized	5,000,000.0
Preferred stock, par value	$ 0.01
Preferred stock, shares outstanding	0	0		0
Common stock, shares authorized	150,000,000.0
Common stock, par value	$ 0.01
Common stock, shares issued	73,500,000	68,400,000		70,600,000	69,100,000
Common stock, shares outstanding	73,500,000	68,400,000		70,600,000	69,100,000
Share repurchase program, remaining authorized repurchase amount	$ 110,700,000
Payments for repurchase of company stock	$ 50,000,000.0	$ 31,600,000	[1]
Eighth Share Repurchase Program [Member]
Class of Stock [Line Items]
Share repurchase program, authorized amount					$ 200,000,000.0
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements of this report for additional information.

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