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Stock Option Activity (Detail) - $ / shares	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Outstanding Options at March 31, 2020	1,160,091
Number of Shares, Granted	178,946
Number of Shares, Cancelled	(12,094)
Number of Shares, Outstanding Options at June 30, 2020	1,160,091	1,326,943
Number of Shares, Options Exercisable at June 30, 2020	914,683
Weighted-Average Exercise Price, Outstanding Options at March 31, 2020	$ 80.36
Weighted-Average Exercise Price, Granted	60.20
Weighted-Average Exercise Price, Cancelled	91.58
Weighted Average Fair Value of Options Granted During the Year	$ 22.04

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
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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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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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 grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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