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Credit facility (Details) - USD ($)
3 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2015
Feb. 04, 2015
Jun. 27, 2013
Line of Credit Facility [Line Items]          
Interest expense $ 24,052,000 $ 13,678,000      
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 $ 3,600,000 $ 5,000,000      
Short-term Debt, Weighted Average Interest Rate 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 $ 497,000,000   $ 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