Stock-Based Compensation (Recorded and Unrecorded Stock-based Compensation Liability) (Details) (USD $)
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0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | |||||||||||||||||
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Jan. 31, 2014
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Mar. 31, 2014
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Mar. 31, 2013
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Mar. 31, 2012
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Jan. 31, 2014
Special Cash Dividend
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Oct. 29, 2013
Special Cash Dividend
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Jul. 30, 2012
Special Cash Dividend
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May 29, 2012
Special Cash Dividend
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Dec. 11, 2009
Special Cash Dividend
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Jul. 27, 2009
Special Cash Dividend
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Mar. 31, 2014
Special Cash Dividend
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Mar. 31, 2013
Special Cash Dividend
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Mar. 31, 2014
Stock Options
EIP
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Mar. 31, 2013
Stock Options
EIP
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Mar. 31, 2013
Stock Options
Rollover Options
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Mar. 31, 2014
Stock Options
Special Cash Dividend
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Mar. 31, 2013
Stock Options
Special Cash Dividend
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Nov. 29, 2013
Stock Options
Special Cash Dividend
EIP
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Jun. 28, 2013
Stock Options
Special Cash Dividend
EIP
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Mar. 31, 2014
Stock Options
Special Cash Dividend
EIP
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Mar. 31, 2014
Stock Options
Special Cash Dividend
EIP
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Mar. 31, 2013
Stock Options
Special Cash Dividend
EIP
|
Sep. 30, 2013
Stock Options
Special Cash Dividend
Rollover Options
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Mar. 31, 2014
Stock Options
Special Cash Dividend
Rollover Options
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Mar. 31, 2013
Stock Options
Special Cash Dividend
Rollover Options
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||||||||||||
Dividends declared per share | $ 1.00 | $ 1.00 | $ 6.50 | $ 1.50 | $ 4.642 | $ 1.087 | |||||||||||||||||||
Share-based Compensation Arrangement by Share-based Payment Award, Options, Dividend Equivalent, Per Share | $ 1.00 | ||||||||||||||||||||||||
Cash payment for special dividends | $ 56,138,000 | $ 49,765,000 | $ 0 | $ 4,200,000 | $ 13,900,000 | $ 4,100,000 | $ 34,000,000 | ||||||||||||||||||
Share-based compensation arrangement, plan modification, incremental compensation cost | 1,600,000 | ||||||||||||||||||||||||
Share-based compensation arrangement, plan modification, incremental compensation cost recognized in period | 2,100,000 | ||||||||||||||||||||||||
Share-based compensation arrangement, plan modification, incremental compensation cost, deferred | 1,000,000 | 1,000,000 | |||||||||||||||||||||||
Share-based compensation arrangement, plan modification, incremental compensation cost, deferred, recognition period | 3 years 3 months | ||||||||||||||||||||||||
Recorded and unrecorded stock-based compensation liability, current and noncurrent | 73,100,000 | 106,400,000 | |||||||||||||||||||||||
Stock-based compensation liability, current | 39,900,000 | 48,500,000 | 48,468,000 | 3,675,000 | 3,675,000 | 14,429,000 | 36,247,000 | 34,039,000 | |||||||||||||||||
Stock-based compensation liability | 39,922,000 | 48,468,000 | |||||||||||||||||||||||
Stock-based compensation liability, non-current | 25,966,000 | 50,625,000 | 25,966,000 | 50,625,000 | 25,966,000 | 50,625,000 | |||||||||||||||||||
Stock-based compensation liability, current and noncurrent | 65,900,000 | 99,100,000 | 65,888,000 | 99,093,000 | 3,675,000 | 3,675,000 | 14,429,000 | 62,213,000 | 84,664,000 | ||||||||||||||||
Unrecorded stock-based compensation liability, current and noncurrent | $ 7,200,000 | $ 7,200,000 | $ 4,500,000 | $ 2,800,000 | |||||||||||||||||||||
Unrecognized compensation cost, amortization period | 5 years 0 months | 3 years 1 month 5 days | 2 years 9 months 8 days | 0 years 3 months 0 days | 5 years 0 months |