Financial Instruments - Outstanding Currency, Forward Exchange Contracts (Detail) $ in Thousands	Jan. 31, 2016 USD ($)
Derivative [Line Items]
Fair Market Value of foreign currency derivative contracts	$ (929)
Foreign Currency Forward Contracts [Member] | Sell [Member]
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	245,127
Fair Market Value of foreign currency derivative contracts	244,406
Foreign Currency Forward Contracts [Member] | Buy [Member]
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	227,534
Fair Market Value of foreign currency derivative contracts	225,884
Euro [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member]
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	165,216
Fair Market Value of foreign currency derivative contracts	165,590
Euro [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member]
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	67,513
Fair Market Value of foreign currency derivative contracts	67,178
British Pound [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member]
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	52,087
Fair Market Value of foreign currency derivative contracts	51,409
British Pound [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member]
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	37,824
Fair Market Value of foreign currency derivative contracts	36,776
Japanese Yen [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member]
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	23,654
Fair Market Value of foreign currency derivative contracts	23,221
Japanese Yen [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member]
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	17,559
Fair Market Value of foreign currency derivative contracts	17,505
Australian Dollar [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member]
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	525
Fair Market Value of foreign currency derivative contracts	531
Australian Dollar [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member]
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	6,918
Fair Market Value of foreign currency derivative contracts	6,925
Hong Kong Dollar [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member]
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	62,663
Fair Market Value of foreign currency derivative contracts	62,446
Singapore Dollar [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member]
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	375
Fair Market Value of foreign currency derivative contracts	378
Singapore Dollar [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member]
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	11,624
Fair Market Value of foreign currency derivative contracts	11,657
Others [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member]
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	3,270
Fair Market Value of foreign currency derivative contracts	3,277
Others [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member]
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	23,433
Fair Market Value of foreign currency derivative contracts	$ 23,397