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Stock Options Outstanding (Detail)	6 Months Ended
	Sep. 30, 2015 $ / shares shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Options Outstanding, Number of Shares Outstanding | shares	1,846,727
Options Outstanding, Weighted-Average Remaining Contractual Life	6 years 10 months 21 days
Options Outstanding, Weighted-Average Exercise Price	$ 52.68
Options Exercisable, Number of Shares Outstanding | shares	1,252,675
Options Exercisable, Weighted-Average Exercise Price	$ 40.29
$23.17 – $ 30.74 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range	23.17
Range of Exercise Prices, Upper Range	$ 30.74
Options Outstanding, Number of Shares Outstanding | shares	504,200
Options Outstanding, Weighted-Average Remaining Contractual Life	4 years 4 months 10 days
Options Outstanding, Weighted-Average Exercise Price	$ 26.65
Options Exercisable, Number of Shares Outstanding | shares	502,200
Options Exercisable, Weighted-Average Exercise Price	$ 26.64
$33.08 – $ 37.95 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range	33.08
Range of Exercise Prices, Upper Range	$ 37.95
Options Outstanding, Number of Shares Outstanding | shares	478,868
Options Outstanding, Weighted-Average Remaining Contractual Life	6 years 4 months 28 days
Options Outstanding, Weighted-Average Exercise Price	$ 33.96
Options Exercisable, Number of Shares Outstanding | shares	458,868
Options Exercisable, Weighted-Average Exercise Price	$ 33.92
$53.22 – $ 74.10 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range	53.22
Range of Exercise Prices, Upper Range	$ 74.10
Options Outstanding, Number of Shares Outstanding | shares	282,936
Options Outstanding, Weighted-Average Remaining Contractual Life	7 years 3 months 26 days
Options Outstanding, Weighted-Average Exercise Price	$ 66.60
Options Exercisable, Number of Shares Outstanding | shares	189,039
Options Exercisable, Weighted-Average Exercise Price	$ 66.67
$79.90 – $ 93.56 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range	79.73
Range of Exercise Prices, Upper Range	$ 93.56
Options Outstanding, Number of Shares Outstanding | shares	580,723
Options Outstanding, Weighted-Average Remaining Contractual Life	9 years 3 months
Options Outstanding, Weighted-Average Exercise Price	$ 83.92
Options Exercisable, Number of Shares Outstanding | shares	102,568
Options Exercisable, Weighted-Average Exercise Price	$ 86.95

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



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