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Credit facility (Details) (USD $)
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Credit Agreement Maturity June 27, 2018 [Member]
Dec. 31, 2013
Credit Agreement Maturity June 27, 2018 [Member]
Jun. 27, 2013
Credit Agreement Maturity June 27, 2018 [Member]
Dec. 31, 2013
Credit Agreement Maturity June 27, 2018 [Member]
Line of Credit [Member]
Jun. 27, 2013
Credit Agreement Maturity June 27, 2018 [Member]
Line of Credit [Member]
Dec. 31, 2013
Credit Agreement Maturity June 27, 2018 [Member]
Line of Credit [Member]
Debt Instrument Interest Rate Option1 [Member]
Jun. 27, 2013
Credit Agreement Maturity June 27, 2018 [Member]
Line of Credit [Member]
Debt Instrument Interest Rate Option1 [Member]
Jun. 27, 2013
Credit Agreement Maturity June 27, 2018 [Member]
Line of Credit [Member]
Debt Instrument Interest Rate Option1 [Member]
Minimum [Member]
Jun. 27, 2013
Credit Agreement Maturity June 27, 2018 [Member]
Line of Credit [Member]
Debt Instrument Interest Rate Option1 [Member]
Maximum [Member]
Dec. 31, 2013
Credit Agreement Maturity June 27, 2018 [Member]
Line of Credit [Member]
Debt Instrument Interest Rate Option 2 [Member]
Jun. 27, 2013
Credit Agreement Maturity June 27, 2018 [Member]
Line of Credit [Member]
Debt Instrument Interest Rate Option 2 [Member]
Jun. 27, 2013
Credit Agreement Maturity June 27, 2018 [Member]
Line of Credit [Member]
Debt Instrument Interest Rate Option 2 [Member]
Minimum [Member]
Jun. 27, 2013
Credit Agreement Maturity June 27, 2018 [Member]
Line of Credit [Member]
Debt Instrument Interest Rate Option 2 [Member]
Maximum [Member]
Jun. 27, 2013
Credit Agreement Maturity June 27, 2018 [Member]
Line of Credit Facility Foreign Currency Sublimit [Member]
Jun. 27, 2013
Credit Agreement Maturity June 27, 2018 [Member]
Line of Credit Facility Letter of Credit Sublimit [Member]
Jun. 27, 2013
Credit Agreement Maturity June 27, 2018 [Member]
Line of Credit Facility Swingline Loan Sublimit [Member]
Dec. 31, 2013
Credit Agreement Maturity June 27, 2018 [Member]
Term loan [Member]
Jun. 27, 2013
Credit Agreement Maturity June 27, 2018 [Member]
Term loan [Member]
Dec. 31, 2013
Credit Agreement Maturity June 27, 2018 [Member]
Revolving credit facility [Member]
Jun. 27, 2013
Credit Agreement Maturity June 27, 2018 [Member]
Revolving credit facility [Member]
Dec. 31, 2012
Credit agreement Maturity August 12, 2016 [Member]
Dec. 31, 2012
Credit agreement Maturity August 12, 2016 [Member]
Line of Credit Facility [Line Items]                                                    
Initiation date           Jun. 27, 2013                                        
Credit agreement             $ 2,000,000,000.0                     $ 125,000,000 $ 35,000,000 $ 25,000,000   $ 350,000,000   $ 1,650,000,000.00    
Borrowings outstanding under the Credit Agreement         650,000,000 650,000,000                             350,000,000   300,000,000      
Maturity Date           Jun. 27, 2018                                        
Increase option amount             300,000,000                                      
Debt discount         1,200,000 1,200,000                                        
Spread on variable rate (percentage)                       0.25% 1.25%     1.25% 2.25%                  
Description of variable rate basis                   the highest of JPMorgan Chase Bank, N.A.'s prime rate, the federal funds rate plus a margin equal to 0.50% and the adjusted LIBOR rate for a 1-month interest period plus a margin equal to 1.00%       adjusted LIBOR rate (based on one, two, three, or six-month interest periods)                        
Additional basis on variable rate base (percentage)                     0.50%       1.00%                      
Period for leverage ratio to determine interest rate spread               preceding four fiscal quarter period                                    
Interest expense $ 12,545,000 $ 11,077,000 $ 36,755,000 $ 30,983,000 $ 4,100,000 $ 11,500,000                                     $ 3,100,000 $ 6,100,000
Interest rate spread on overdue principal in event of default (percentage)                 2.00%                                  
Interest rate spread on overdue amounts in event of default (percentage)                 2.00%