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Share-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 28, 2015 $ / shares shares | Aug. 04, 2015 shares | Jul. 01, 2015 $ / shares shares | Jun. 01, 2015 USD ($) | May. 11, 2015 $ / shares shares | Apr. 22, 2015 shares | May. 31, 2014 shares | Jun. 30, 2014 shares | Mar. 31, 2016 USD ($) $ / shares shares | Mar. 31, 2015 USD ($) $ / shares shares | Mar. 31, 2014 USD ($) $ / shares shares | Aug. 04, 2014 director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation costs charged against income | $ |  |  |  |  |  |  |  |  | $ 9,954 | $ 6,918 | $ 5,146 |
Tax benefit recognized from share-based compensation expense | $ |  |  |  |  |  |  |  |  | $ 3,500 | $ 1,900 | $ 1,500 |
Restricted Shares |  |  |  |  |  |  |  |  |  |  |  |
Options granted, shares |  |  |  |  |  |  |  |  | 208,200 | 317,900 | 227,700 |
Options granted, weighted-average exercise price (in USD per share) | $ / shares |  |  |  |  |  |  |  |  | $ 42.13 | $ 33.54 | $ 29.94 |
Number of directors, board of directors | director |  |  |  |  |  |  |  |  |  |  |  | 6
Options |  |  |  |  |  |  |  |  |  |  |  |
Options exercised, intrinsic value | $ |  |  |  |  |  |  |  |  | $ 8,600 | $ 9,300 | $ 14,000 |
Share-based compensation expense, not yet recognized | $ |  |  |  |  |  |  |  |  | $ 10,100 |  |  |
Share-based compensation expense, not yet recognized, period for recognition |  |  |  |  |  |  |  |  | 12 months 12 days |  |  |
Fair value of awards vested during period | $ |  |  |  |  |  |  |  |  | $ 7,000 | 4,700 | 3,400 |
Proceeds from exercise of stock awards | $ |  |  |  |  |  |  |  |  | 6,689 | 3,954 | 5,907 |
Income tax benefit realized from exercise of stock awards | $ |  |  |  |  |  |  |  |  | $ 2,100 | $ 2,200 | $ 1,700 |
President and Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |  |  |  |  |
Accelerated stock-based compensation cost | $ |  |  |  | $ 800 |  |  |  |  |  |  |  |
Restricted common stock units granted in period, shares |  |  |  |  |  | 57,924 |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |  |  |  |  |
Restricted common stock units granted in period, shares |  | 2,075 | 2,841 |  | 185,904 |  |  |  |  |  |  |
Award vesting period |  | 1 year | 3 years |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | $ 42.41 | $ 33.33 | $ 30.19 |
Restricted Stock Units (RSUs) | Tranche 1 |  |  |  |  |  |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |  |  |  |  |
Restricted common stock units granted in period, shares |  |  |  |  | 163,404 |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 3 years |  |  |  |  |  |  |
Restricted Stock Units (RSUs) | Tranche 2 |  |  |  |  |  |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |  |  |  |  |
Restricted common stock units granted in period, shares |  |  |  |  | 22,500 |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 3 years |  |  |  |  |  |  |
Award vesting rights, percentage |  |  |  |  | 33.30% |  |  |  |  |  |  |
Restricted Stock Units (RSUs) | Chief Financial Officer |  |  |  |  |  |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |  |  |  |  |
Restricted common stock units granted in period, shares | 6,612 |  |  |  |  |  |  |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) | Employee |  |  |  |  |  |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  | 3 years |  |  |
Restricted Stock Units (RSUs) | Director |  |  |  |  |  |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |  |  |  |  |
Restricted common stock units granted in period, shares |  |  |  |  | 362 |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  | 1 year |  |  |
Award settlement period |  |  |  |  |  |  |  |  | 6 months |  |  |
Restricted stock units, number of securities into which each RSU may be converted |  | 1 |  |  |  |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |  |  |  |  |
Restricted common stock units granted in period, shares |  |  | 13,861 |  |  |  |  |  |  |  |  |
Options granted, shares |  |  |  |  | 186,302 |  |  |  |  |  |  |
Award vesting period |  |  | 3 years |  | 3 years |  |  |  |  |  |  |
Award vesting rights, percentage |  |  | 33.30% |  | 33.30% |  |  |  |  |  |  |
Expiration period |  |  | 10 years |  |  |  |  |  |  |  |  |
Options granted, weighted-average exercise price (in USD per share) | $ / shares |  |  | $ 46.58 |  | $ 41.44 |  |  |  |  |  |  |
Granted, weighted-average grant-date fair value (in USD per share) | $ / shares |  |  |  |  |  |  |  |  | $ 17.24 | $ 15.95 | $ 13.94 |
Stock Options | Chief Financial Officer |  |  |  |  |  |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |  |  |  |  |
Options granted, shares | 8,079 |  |  |  |  |  |  |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |  |  |  |  |  |  |
Award vesting rights, percentage | 33.30% |  |  |  |  |  |  |  |  |  |  |
Expiration period | 10 years |  |  |  |  |  |  |  |  |  |  |
Options granted, weighted-average exercise price (in USD per share) | $ / shares | $ 50.42 |  |  |  |  |  |  |  |  |  |  |
Stock Options | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  | 3 years |  |  |
Stock Options | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 10 years |  |  |  | 5 years |  |  |
Options |  |  |  |  |  |  |  |  |  |  |  |
Award exercisability period, from date of grant (not greater than) |  |  |  |  |  |  |  |  | 10 years |  |  |
Restricted Shares |  |  |  |  |  |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |  |  |  |  |
Restricted common stock units granted in period, shares |  |  |  |  |  |  |  |  | 266,100 | 106,900 | 126,600 |
Granted, weighted-average grant-date fair value (in USD per share) | $ / shares |  |  |  |  |  |  |  |  | $ 42.41 | $ 33.33 | $ 30.19 |
Restricted Shares | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  | 3 years |  |  |
Restricted Shares | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  | 5 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 |  |  |  |  |  |  |  | 1,800,000.0 |  |  |  |
Maximum number of shares awarded, per employee, annual |  |  |  |  |  |  | 1,000,000 | 2,500,000.0 |  |  |  |
Increase to plan term |  |  |  |  |  |  |  | 10 years |  |  |  |
Options |  |  |  |  |  |  |  |  |  |  |  |
Number of shares available for issuance under plan |  |  |  |  |  |  |  |  | 2,600,000 |  |  |

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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 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 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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