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Share-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
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Nov. 14, 2016 $ / shares shares | Sep. 12, 2016 $ / shares shares | Aug. 02, 2016 shares | May 26, 2016 shares | May 09, 2016 $ / shares shares | May 31, 2014 shares | Jun. 30, 2014 shares | Mar. 31, 2017 USD ($) $ / shares shares | Mar. 31, 2016 USD ($) $ / shares shares | Mar. 31, 2015 USD ($) $ / shares shares | Aug. 04, 2014 director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase to plan term |  |  |  |  |  |  | 10 years |  |  |  |
Stock-based compensation costs | $ |  |  |  |  |  |  |  | $ 8,148 | $ 9,954 | $ 6,918 |
Tax benefit recognized from share-based compensation expense | $ |  |  |  |  |  |  |  | 2,600 | 3,500 | 1,900 |
Share-based compensation expense, not yet recognized | $ |  |  |  |  |  |  |  | $ 7,900 |  |  |
Share-based compensation expense, not yet recognized, period for recognition |  |  |  |  |  |  |  | 9 months 18 days |  |  |
Total fair value of shares vested | $ |  |  |  |  |  |  |  | $ 6,000 | $ 7,000 | $ 4,700 |
Exercise of stock options (in shares) |  |  |  |  |  |  |  | 126,800 | 348,000 | 386,300 |
Cash received from exercise of stock options | $ |  |  |  |  |  |  |  | $ 4,000 | $ 6,700 | $ 4,000 |
Income tax benefit realized from exercise of stock awards | $ |  |  |  |  |  |  |  | $ 900 | $ 2,100 | $ 2,200 |
Number of shares available for issuance under plan |  |  |  |  |  |  |  | 2,400,000 |  |  |
Options granted, shares |  |  |  |  |  |  |  | 264,300 | 208,200 | 317,900 |
Options granted, weighted-average exercise price (in USD per share) | $ / shares |  |  |  |  |  |  |  | $ 55.86 | $ 42.13 | $ 33.54 |
Restricted Shares |  |  |  |  |  |  |  |  |  |  |
Number of directors, board of directors | director |  |  |  |  |  |  |  |  |  |  | 6
Options |  |  |  |  |  |  |  |  |  |  |
Options exercised, intrinsic value | $ |  |  |  |  |  |  |  | $ 3,200 | $ 8,600 | $ 9,300 |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vested in period (in shares) |  |  |  |  |  |  |  | 94,718 | 155,603 | 154,418 |
Common stock units granted in period, shares |  |  | 1,896 |  | 49,064 |  |  | 68,400 | 266,100 | 106,900 |
Award vesting period |  |  |  |  | 3 years |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |  |  |  |
Period following director's term In which stock awards may be settled |  |  |  |  |  |  |  | 6 months |  |  |
Granted, weighted-average grant-date fair value (in USD per share) | $ / shares |  |  |  |  |  |  |  | $ 55.44 | $ 42.41 | $ 33.33 |
Restricted Stock Units (RSUs) | Chief Financial Officer |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock units granted in period, shares |  | 5,012 |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) | Executive Vice President |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock units granted in period, shares | 2,664 |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) | Employee |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  | 3 years |  |  |
Restricted Stock Units (RSUs) | Director |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock units granted in period, shares |  |  |  | 346 |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  | 1 year |  |  |
Restricted Stock Units (RSUs) | Minimum |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  | 3 years |  |  |
Restricted Stock Units (RSUs) | Maximum |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  | 5 years |  |  |
Stock Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  |  |  |  |  |  |  | 126,820,000 | 348,055,000 | 386,254,000 |
Options granted, shares |  |  |  |  | 224,843 |  |  |  |  |  |
Award vesting period |  |  |  |  | 3 years |  |  |  |  |  |
Award vesting rights, percentage |  |  |  |  | 33.30% |  |  |  |  |  |
Expiration period |  |  |  |  | 10 years |  |  |  |  |  |
Grant date exercise price (in USD per share) | $ / shares |  |  |  |  | $ 57.18 |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |  |  |  |
Granted, weighted-average grant-date fair value (in USD per share) | $ / shares |  |  |  |  |  |  |  | $ 21.75 | $ 17.24 | $ 15.95 |
Stock Options | Chief Financial Officer |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Options granted, shares |  | 25,746 |  |  |  |  |  |  |  |  |
Award vesting period |  | 3 years |  |  |  |  |  |  |  |  |
Expiration period |  | 10 years |  |  |  |  |  |  |  |  |
Grant date exercise price (in USD per share) | $ / shares |  | $ 47.39 |  |  |  |  |  |  |  |  |
Stock Options | Chief Financial Officer | Tranche 1 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Award vesting rights, percentage |  | 33.30% |  |  |  |  |  |  |  |  |
Stock Options | Executive Vice President |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Options granted, shares | 13,683 |  |  |  |  |  |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |  |  |  |  |  |
Expiration period | 10 years |  |  |  |  |  |  |  |  |  |
Grant date exercise price (in USD per share) | $ / shares | $ 50.06 |  |  |  |  |  |  |  |  |  |
Stock Options | Executive Vice President | Tranche 1 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Award vesting rights, percentage | 33.30% |  |  |  |  |  |  |  |  |  |
Stock Options | Minimum |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  | 3 years |  |  |
Stock Options | Maximum |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  | 5 years |  |  |
Options |  |  |  |  |  |  |  |  |  |  |
Award exercisability period, from date of grant (not greater than) |  |  |  |  |  |  |  | 10 years |  |  |
2005 Long-term Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for grant |  |  |  |  |  |  |  | 5,000,000.0 |  |  |
Number of additional shares authorized under plan (in shares) |  |  |  |  |  |  | 1,800,000.0 |  |  |  |
Maximum number of shares awarded, per employee, annual |  |  |  |  |  | 1,000,000 | 2,500,000.0 |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements. + 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- 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 The weighted average fair value at grant date for nonvested equity-based awards issued 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 The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 highest quantity of shares an employee can purchase under the plan per 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The grant-date intrinsic 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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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + 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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