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Stock-Based Compensation (Stock-Based Awards Issued During The Period) (Details) - $ / shares | 6 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Restricted Stock Units (RSUs) [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number granted | 59,550 | 63,425
Grant date fair value | $ 66.05 | $ 55.93
Performance Share Awards (PSAs) [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number granted | 39,100 | 54,675
Grant date fair value | $ 60.37 | $ 49.17

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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 Net number of share options (or share units) granted during the period. + 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)(iv)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Details
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