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Credit facility (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Mar. 31, 2015
Feb. 04, 2015
Jun. 27, 2013
Line of Credit Facility [Line Items]              
Interest expense $ 25,644,000 $ 14,019,000 $ 49,696,000 $ 27,697,000      
Credit Agreement Maturity June 27, 2018 [Member]              
Line of Credit Facility [Line Items]              
Credit agreement maximum borrowing amount             $ 2,000,000,000.0
February 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 [Member]              
Line of Credit Facility [Line Items]              
Credit agreement maximum borrowing amount           $ 2,555,000,000.000  
Increase option amount           $ 300,000,000  
Interest expense $ 4,900,000 $ 5,100,000 $ 8,500,000 $ 10,100,000      
Short-term Debt, Weighted Average Interest Rate 1.44%   1.44%        
February 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 [Member] | Revolving credit facility [Member]              
Line of Credit Facility [Line Items]              
Amount of credit agreement borrowings outstanding $ 1,296,500,000   $ 1,296,500,000   $ 462,000,000    
Period for leverage ratio to determine interest rate spread     preceding four fiscal quarters        
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%  
February 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 [Member] | Revolving credit facility [Member] | Debt Instrument Interest Rate Option1 [Member]              
Line of Credit Facility [Line Items]              
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%        
February 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 [Member] | Revolving credit facility [Member] | Debt Instrument Interest Rate Option1 [Member] | Minimum [Member]              
Line of Credit Facility [Line Items]              
Spread on variable rate (percentage)     0.25%        
February 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 [Member] | Revolving credit facility [Member] | Debt Instrument Interest Rate Option1 [Member] | Maximum [Member]              
Line of Credit Facility [Line Items]              
Spread on variable rate (percentage)     1.25%        
February 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 [Member] | Revolving credit facility [Member] | Debt Instrument Interest Rate Option 2 [Member]              
Line of Credit Facility [Line Items]              
Description of variable rate basis     adjusted LIBOR rate (based on one, two, three, or six-month interest periods)        
February 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 [Member] | Revolving credit facility [Member] | Debt Instrument Interest Rate Option 2 [Member] | Minimum [Member]              
Line of Credit Facility [Line Items]              
Spread on variable rate (percentage)     1.25%        
February 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 [Member] | Revolving credit facility [Member] | Debt Instrument Interest Rate Option 2 [Member] | Maximum [Member]              
Line of Credit Facility [Line Items]              
Spread on variable rate (percentage)     2.25%        
February 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 [Member] | Foreign Line of Credit [Member]              
Line of Credit Facility [Line Items]              
Credit agreement maximum borrowing amount           $ 125,000,000  
February 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 [Member] | Standby Letters of Credit [Member]              
Line of Credit Facility [Line Items]              
Credit agreement maximum borrowing amount           25,000,000  
February 2015 Amended Credit Facility with Maturity Dates of June 2018 and February 2020 [Member] | Line of Credit Facility Swingline Loan Sublimit [Member]              
Line of Credit Facility [Line Items]              
Credit agreement maximum borrowing amount           $ 25,000,000