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Stock-Based Compensation (Recorded and Unrecorded Stock-based Compensation Liability) (Details) (USD $)
0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended
Jan. 31, 2014
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Jan. 31, 2014
Special Cash Dividend
Oct. 29, 2013
Special Cash Dividend
Jul. 30, 2012
Special Cash Dividend
May 29, 2012
Special Cash Dividend
Dec. 11, 2009
Special Cash Dividend
Jul. 27, 2009
Special Cash Dividend
Mar. 31, 2014
Special Cash Dividend
Mar. 31, 2013
Special Cash Dividend
Mar. 31, 2014
Stock Options
EIP
Mar. 31, 2013
Stock Options
EIP
Mar. 31, 2013
Stock Options
Rollover Options
Mar. 31, 2014
Stock Options
Special Cash Dividend
Mar. 31, 2013
Stock Options
Special Cash Dividend
Nov. 29, 2013
Stock Options
Special Cash Dividend
EIP
Jun. 28, 2013
Stock Options
Special Cash Dividend
EIP
Mar. 31, 2014
Stock Options
Special Cash Dividend
EIP
Mar. 31, 2014
Stock Options
Special Cash Dividend
EIP
Mar. 31, 2013
Stock Options
Special Cash Dividend
EIP
Sep. 30, 2013
Stock Options
Special Cash Dividend
Rollover Options
Mar. 31, 2014
Stock Options
Special Cash Dividend
Rollover Options
Mar. 31, 2013
Stock Options
Special Cash Dividend
Rollover Options
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