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Financial Instruments - Outstanding Currency, Forward Exchange Contracts (Detail) $ in Thousands | Jan. 31, 2018 USD ($)
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Derivative [Line Items] |
Fair Market Value of foreign currency derivative contracts | $ (674)
Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 257,746
Fair Market Value of foreign currency derivative contracts | 264,356
Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 343,313
Fair Market Value of foreign currency derivative contracts | 349,229
Euro [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 151,860
Fair Market Value of foreign currency derivative contracts | 156,357
Euro [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 82,214
Fair Market Value of foreign currency derivative contracts | 83,310
British Pound [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 42,565
Fair Market Value of foreign currency derivative contracts | 43,469
British Pound [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 54,821
Fair Market Value of foreign currency derivative contracts | 57,017
Japanese Yen [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 55,161
Fair Market Value of foreign currency derivative contracts | 56,229
Japanese Yen [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 25,348
Fair Market Value of foreign currency derivative contracts | 25,996
Australian Dollar [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 559
Fair Market Value of foreign currency derivative contracts | 564
Australian Dollar [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 7,874
Fair Market Value of foreign currency derivative contracts | 8,317
Hong Kong Dollar [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 107,854
Fair Market Value of foreign currency derivative contracts | 107,503
Singapore Dollar [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 975
Fair Market Value of foreign currency derivative contracts | 996
Singapore Dollar [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 12,738
Fair Market Value of foreign currency derivative contracts | 13,116
Others [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 6,626
Fair Market Value of foreign currency derivative contracts | 6,741
Others [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 52,464
Fair Market Value of foreign currency derivative contracts | $ 53,970

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