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Share-Based Compensation - Balance of Outstanding and Exercisable Stock Options (Detail) $ / shares in Units, $ in Millions	3 Months Ended
	Sep. 30, 2018 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Option Awards Outstanding, Balance as of June 30, 2018 | shares	1,618,209
Stock Option Awards Outstanding, Exercised | shares	(73,362)
Stock Option Awards Outstanding, Forfeited | shares	(17,923)
Stock Option Awards Outstanding, Balance as of September 30, 2018 | shares	1,526,924
Stock Option Awards Outstanding, Exercisable at September 30, 2018 | shares	1,348,071
Weighted Average Exercise Price, Balance as of June 30, 2018 | $ / shares	$ 57.14
Weighted Average Exercise Price, Exercised | $ / shares	28.60
Weighted Average Exercise Price, Forfeited | $ / shares	70.09
Weighted Average Exercise Price, Balance as of September 30, 2018 | $ / shares	58.36
Weighted Average Exercise Price, Exercisable at September 30, 2018 | $ / shares	$ 58.61
Aggregate Intrinsic Value, Balance as of September 30, 2018 | $	$ 5.3
Aggregate Intrinsic Value, Exercisable at September 30, 2018 | $	$ 5.3

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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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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 grantees can acquire the shares reserved for issuance under the stock option plan.

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

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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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Number of share options (or share units) exercised during the current period.

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