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Share-Based Compensation - Schedule of Stock Option Activity (Detail) $ / shares in Units, $ in Millions	6 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Option Awards Outstanding, Balance as of June 2020 | shares	329,786
Stock Option Awards Outstanding, Exercised | shares	(76,060)
Stock Option Awards Outstanding, Expired | shares	(53,561)
Stock Option Awards Outstanding, Balance as of December 2020 | shares	200,165
Weighted Average Exercise Price, Balance as of June 2020 | $ / shares	$ 69.78
Weighted Average Exercise Price, Exercised | $ / shares	61.73
Weighted Average Exercise Price, Expired | $ / shares	75.48
Weighted Average Exercise Price, Balance as of December 2020 | $ / shares	$ 71.31
Aggregate Intrinsic Value, Balance as of December 2020 | $	$ 3.1

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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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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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