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Debt (Details) (USD $)
3 Months Ended 6 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Mar. 31, 2012
Long-term Debt, Current and Noncurrent [Abstract]      
Long-term debt $ 1,737,588,000 $ 1,737,588,000 $ 965,425,000
Less: Current portion of long-term debt (46,500,000) (46,500,000) (42,500,000)
Long-term debt, net of current portion 1,691,088,000 1,691,088,000 922,925,000
Amortization of original issuance discount on debt 7,200,000    
Debt issuance costs 2,700,000    
Long-term debt, unamortized discount 12,400,000 12,400,000 4,600,000
Secured Debt
     
Long-term Debt, Current and Noncurrent [Abstract]      
Extinguishment of debt during period 1,000,000,000    
Secured Debt | Tranche A Loans
     
Long-term Debt, Current and Noncurrent [Abstract]      
Interest rate 2.97% 2.97% 2.49%
Long-term debt 724,165,000 724,165,000 472,870,000
Term loan, face amount 725,000,000 725,000,000  
Quarterly principal periodic payment percentage   1.25%  
Quarterly principal periodic payment percentage, year two 1.875% 1.875%  
Quarterly principal periodic payment percentage, year three 2.50% 2.50%  
Quarterly principal periodic payment percentage, year four 3.125% 3.125%  
Quarterly principal periodic payment percentage, year five 13.00% 13.00%  
Long-term debt, variable rate basis LIBOR    
Long-term debt, basis spread on variable rate 2.75% 2.75%  
Extinguishment of debt during period 500,000,000    
Secured Debt | Tranche A Loans | Minimum
     
Long-term Debt, Current and Noncurrent [Abstract]      
Long-term debt, basis spread on variable rate 2.00% 2.00%  
Secured Debt | Tranche A Loans | Maximum
     
Long-term Debt, Current and Noncurrent [Abstract]      
Long-term debt, basis spread on variable rate 2.75% 2.75%  
Secured Debt | Tranche B Loans
     
Long-term Debt, Current and Noncurrent [Abstract]      
Interest rate 4.50% 4.50% 3.75%
Long-term debt 1,013,423,000 1,013,423,000 492,555,000
Term loan, face amount 1,025,000,000 1,025,000,000  
Quarterly principal periodic payment percentage   0.25%  
Quarterly principal periodic payment percentage, year two 0.25% 0.25%  
Quarterly principal periodic payment percentage, year three 0.25% 0.25%  
Quarterly principal periodic payment percentage, year four 0.25% 0.25%  
Quarterly principal periodic payment percentage, year five 0.25% 0.25%  
Quarterly principal periodic payment percentage, year six 0.25% 0.25%  
Long-term debt, variable rate basis LIBOR    
Long-term debt, basis spread on variable rate 3.50% 3.50%  
Extinguishment of debt during period 500,000,000    
Secured Debt | Tranche B Loans | Minimum
     
Long-term Debt, Current and Noncurrent [Abstract]      
Long-term debt, basis spread on variable rate 1.00% 1.00%  
Revolving Credit Facility
     
Long-term Debt, Current and Noncurrent [Abstract]      
Revolving credit facility, maximum borrowing capacity 500,000,000 500,000,000  
Revolving credit facility, amount outstanding 0 0 0
Extinguishment of debt during period 275,000,000    
Letter of Credit
     
Long-term Debt, Current and Noncurrent [Abstract]      
Revolving credit facility, maximum borrowing capacity $ 100,000,000 $ 100,000,000