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Stock Options Outstanding (Detail) | 9 Months Ended
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Dec. 31, 2017 $ / shares shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Outstanding Options, Number of Shares Outstanding | shares | 984,932
Outstanding Options, Weighted-Average Remaining Contractual Life | 6 years 10 months 24 days
Outstanding Options, Weighted-Average Exercise Price | $ 72.76
Exercisable Options, Number of Shares Outstanding | shares | 597,945
Exercisable Options, Weighted-Average Exercise Price | $ 65.18
$23.17 - $29.84 [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 | $ 29.84
Outstanding Options, Number of Shares Outstanding | shares | 65,912
Outstanding Options, Weighted-Average Remaining Contractual Life | 3 years 7 months 6 days
Outstanding Options, Weighted-Average Exercise Price | $ 23.27
Exercisable Options, Number of Shares Outstanding | shares | 65,912
Exercisable Options, Weighted-Average Exercise Price | $ 23.47
$33.43 - $ 37.34 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Range of Exercise Prices, Lower Range | 33.43
Range of Exercise Prices, Upper Range | $ 37.34
Outstanding Options, Number of Shares Outstanding | shares | 99,582
Outstanding Options, Weighted-Average Remaining Contractual Life | 4 years 5 months 15 days
Outstanding Options, Weighted-Average Exercise Price | $ 33.94
Exercisable Options, Number of Shares Outstanding | shares | 99,582
Exercisable Options, Weighted-Average Exercise Price | $ 33.94
$53.22 - $ 77.67 [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 | $ 77.67
Outstanding Options, Number of Shares Outstanding | shares | 308,924
Outstanding Options, Weighted-Average Remaining Contractual Life | 7 years 2 months 26 days
Outstanding Options, Weighted-Average Exercise Price | $ 71.06
Exercisable Options, Number of Shares Outstanding | shares | 158,166
Exercisable Options, Weighted-Average Exercise Price | $ 69.19
$79.73 - $ 106.00 [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 | $ 106.00
Outstanding Options, Number of Shares Outstanding | shares | 510,514
Outstanding Options, Weighted-Average Remaining Contractual Life | 7 years 7 months 6 days
Outstanding Options, Weighted-Average Exercise Price | $ 87.76
Exercisable Options, Number of Shares Outstanding | shares | 274,285
Exercisable Options, Weighted-Average Exercise Price | $ 84.27

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- Definition 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. + References No definition available. + Details
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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 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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 -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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 -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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