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Share-Based Compensation - Schedule of Stock Option Activity (Detail) $ / shares in Units, $ in Millions	9 Months Ended
	Mar. 31, 2020 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Option Awards Outstanding, Balance as of June 30, 2019 | shares	1,191,929
Stock Option Awards Outstanding, Exercised | shares	(445,019)
Stock Option Awards Outstanding, Forfeited | shares	(6,828)
Stock Option Awards Outstanding, Expired | shares	(297,612)
Stock Option Awards Outstanding, Balance as of March 31, 2020 | shares	442,470
Stock Option Awards Outstanding, Exercisable at March 31, 2020 | shares	439,141
Weighted Average Exercise Price, Balance as of June 30, 2019 | $ / shares	$ 59.07
Weighted Average Exercise Price, Exercised | $ / shares	43.48
Weighted Average Exercise Price, Forfeited | $ / shares	51.12
Weighted Average Exercise Price, Expired | $ / shares	73.95
Weighted Average Exercise Price, Balance as of March 31, 2020 | $ / shares	64.86
Weighted Average Exercise Price, Exercisable at March 31, 2020 | $ / shares	$ 64.98
Aggregate Intrinsic Value, Balance as of March 31, 2020 | $	$ 1.9
Aggregate Intrinsic Value, Exercisable at March 31, 2020 | $	$ 1.9

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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