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Preferred and Common Stockholder's Equity - Additional Information (Detail) - USD ($)	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Class Of Stock Disclosures [Abstract]
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	74,700,000	70,600,000	68,400,000
Common stock, shares outstanding	73,500,000	74,700,000	70,600,000	68,400,000
Share repurchase program, authorized amount					$ 200,000,000.0
Share repurchase program, remaining authorized repurchase amount		$ 110,700,000
Payments for repurchase of company stock	$ 50,000,000.0

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Face amount or stated value per share of common stock.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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