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Subsequent Events (Narrative) (Details) - $ / shares |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
May 08, 2017 | Aug. 02, 2016 | May 09, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Subsequent Event [Line Items] |  |  |  |  |  |
Options granted, shares |  |  |  | 264,300 | 208,200 | 317,900
Options granted, weighted-average exercise price (in USD per share) |  |  |  | $ 55.86 | $ 42.13 | $ 33.54
Restricted Stock Units (RSUs) |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Common stock units granted in period, shares |  | 1,896 | 49,064 | 68,400 | 266,100 | 106,900
Award vesting period |  |  | 3 years |  |  |
Stock Options |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Options granted, shares |  |  | 224,843 |  |  |
Award vesting rights, percentage |  |  | 33.30% |  |  |
Award vesting period |  |  | 3 years |  |  |
Expiration period |  |  | 10 years |  |  |
Subsequent event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Options granted, shares | 180,211 |  |  |  |  |
Subsequent event | Performance Shares |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Common stock units granted in period, shares | 35,593 |  |  |  |  |
Subsequent event | Restricted Stock Units (RSUs) |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Common stock units granted in period, shares | 54,269 |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |
Subsequent event | Stock Options |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |
Expiration period | 10 years |  |  |  |  |
Options granted, weighted-average exercise price (in USD per share) | $ 56.11 |  |  |  |  |
Tranche 1 | Subsequent event | Restricted Stock Units (RSUs) |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Award vesting rights, percentage | 33.30% |  |  |  |  |
Tranche 1 | Subsequent event | Stock Options |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Award vesting rights, percentage | 33.30% |  |  |  |  |
Tranche 2 | Subsequent event | Restricted Stock Units (RSUs) |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Award vesting rights, percentage | 33.30% |  |  |  |  |
Tranche 2 | Subsequent event | Stock Options |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Award vesting rights, percentage | 33.30% |  |  |  |  |
Tranche 3 | Subsequent event | Restricted Stock Units (RSUs) |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Award vesting rights, percentage | 33.30% |  |  |  |  |
Tranche 3 | Subsequent event | Stock Options |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Award vesting rights, percentage | 33.30% |  |  |  |  |

X
- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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