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Stock-Based Compensation (Tables) | 12 Months Ended
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Mar. 31, 2012
Stock-Based Compensation [Abstract] |
Stock-Based Awards Issued During The Period |
|  | Three Months Ended June 30,
|  | 2012 |  | 2011
SARs: |  |  |  |
Number granted |  | — |  |  | 170,400 |
Exercise price |  | N/A |  |  | $ | 37.86 |
Grant date fair value |  | N/A |  |  | $ | 7.46 |
RSUs: |  |  |  |
Number granted |  | 63,550 |  |  | 57,100 |
Grant date fair value |  | $ | 44.18 |  |  | $ | 37.86 |
PSAs: |  |  |  |
Number granted |  | 60,850 |  |  | 42,600 |
Grant date fair value |  | $ | 38.14 |  |  | $ | 31.95 |
Black-Scholes Assumptions Used To Estimate Grant Date Fair Value Of SARs Issued During The Period |
| 2011
Expected term | 5 years
Expected volatility | 35.80%
Expected dividend yield | 5.07%
Risk-free interest rate | 1.66%

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65, A240 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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