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Derivatives - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended
May 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Derivative [Line Items]        
Gains (losses) reclassified from AOCI into income (effective portion), Net of Tax   $ 20,719,000 $ 22,262,000  
2.000 Percent Senior Notes [Member]        
Derivative [Line Items]        
Debt instrument, interest rate   2.00%    
Interest Rate Lock [Member] | 2.000 Percent Senior Notes [Member]        
Derivative [Line Items]        
Debt instrument, interest rate 2.00%      
Interest Expense, Net [Member]        
Derivative [Line Items]        
Gains (losses) reclassified from AOCI into income (effective portion), Net of Tax   $ 4,000 (4,000)  
Interest Expense, Net [Member] | Interest Rate Lock [Member]        
Derivative [Line Items]        
Gains (losses) reclassified from AOCI into income (effective portion), Net of Tax   $ (5,000) 5,000  
Interest Expense, Net [Member] | Interest Rate Lock [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Derivative [Line Items]        
Gains (losses) reclassified from AOCI into income (effective portion), Net of Tax $ 100,000      
Not Designated as Hedging Instrument [Member]        
Derivative [Line Items]        
Forward contracts, maturity period   2022-05    
Forward contracts maturity value   $ 291,500,000   $ 419,100,000
Cash Flow Hedging [Member]        
Derivative [Line Items]        
Fair value of forward contracts   $ 1,450,000,000   1,608,000,000
Forward contracts, maturity period   2019-10    
Ineffectiveness recognized   $ 200,000 $ 0  
Amount expected to be reclassified from AOCI to earnings within the next 12 months   74,600,000    
Cash Flow Hedging [Member] | Hedging Instruments [Member] | Designated as Hedging Instrument [Member]        
Derivative [Line Items]        
Fair Value Asset/(Liability) Net   110,378,000   131,879,000
Economic Hedges, Gross [Member] | Designated as Hedging Instrument [Member]        
Derivative [Line Items]        
Fair Value Asset/(Liability) Net   $ 10,746,000   $ 7,380,000
Minimum [Member]        
Derivative [Line Items]        
Foreign exchange contracts maturity period, years   2 years    
Maximum [Member]        
Derivative [Line Items]        
Foreign exchange contracts maturity period, years   3 years