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Stock Compensation Plans - Stock Options Outstanding (Detail) shares in Thousands | 12 Months Ended
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Mar. 31, 2018 $ / shares shares
Range 1 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Exercise Price, Minimum | $ 15.22
Exercise Price, Maximum | $ 15.25
Options Outstanding at March 31, 2018 | shares | 18
Weighted Average Exercise Price | $ 15.24
Weighted Average Remaining Contractual Life (in years) | 1 year 8 months 15 days
Range 2 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Exercise Price, Minimum | $ 18.65
Exercise Price, Maximum | $ 21.19
Options Outstanding at March 31, 2018 | shares | 40
Weighted Average Exercise Price | $ 18.95
Weighted Average Remaining Contractual Life (in years) | 4 years 18 days
Range 3 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Exercise Price, Minimum | $ 30.88
Exercise Price, Maximum | $ 44.50
Options Outstanding at March 31, 2018 | shares | 11
Weighted Average Exercise Price | $ 33.28
Weighted Average Remaining Contractual Life (in years) | 2 months 12 days
Range 4 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Exercise Price, Minimum | $ 15.22
Exercise Price, Maximum | $ 44.50
Options Outstanding at March 31, 2018 | shares | 69
Weighted Average Exercise Price | $ 20.26
Weighted Average Remaining Contractual Life (in years) | 2 years 10 months 2 days

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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 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 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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