Schedule of Outstanding Foreign Currency Forward Contracts (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Buy Contracts
Derivative [Line Items]
Derivatives Designated as Hedging Instruments	$ 72,754
Derivatives Not Designated as Hedging Instruments	248,542
Buy Contracts | Swiss Franc
Derivative [Line Items]
Derivatives Not Designated as Hedging Instruments	20,527
Buy Contracts | British Pound Sterling
Derivative [Line Items]
Derivatives Not Designated as Hedging Instruments	4,579
Buy Contracts | Euro
Derivative [Line Items]
Derivatives Designated as Hedging Instruments	72,754
Derivatives Not Designated as Hedging Instruments	34,432
Buy Contracts | Korean Won
Derivative [Line Items]
Derivatives Not Designated as Hedging Instruments	60,237
Buy Contracts | Taiwan Dollar
Derivative [Line Items]
Derivatives Not Designated as Hedging Instruments	128,767
Sell Contracts
Derivative [Line Items]
Derivatives Designated as Hedging Instruments	125,333
Derivatives Not Designated as Hedging Instruments	104,502
Sell Contracts | Japanese Yen
Derivative [Line Items]
Derivatives Designated as Hedging Instruments	125,333
Derivatives Not Designated as Hedging Instruments	71,511
Sell Contracts | Swiss Franc
Derivative [Line Items]
Derivatives Not Designated as Hedging Instruments	4,321
Sell Contracts | British Pound Sterling
Derivative [Line Items]
Derivatives Not Designated as Hedging Instruments	4,325
Sell Contracts | Euro
Derivative [Line Items]
Derivatives Not Designated as Hedging Instruments	$ 24,345