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Stock-Based Compensation (Stock-Based Awards Issued During The Period) (Details) (USD $) | 3 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012
Restricted Stock Units (RSUs) [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number granted | 52,400 | 63,550
Grant date fair value | $ 59.72 | $ 44.18
Performance Share Awards (PSAs) [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number granted | 52,400 | 60,850
Grant date fair value | $ 53.56 | $ 38.14

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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=6415400&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=6415400&loc=d3e5070-113901 + Details
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