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Financial Instruments - Outstanding Currency, Forward Exchange Contracts (Detail) $ in Thousands | Jan. 31, 2017 USD ($)
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Derivative [Line Items] |
Fair Market Value of foreign currency derivative contracts | $ (253)
Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 190,649
Fair Market Value of foreign currency derivative contracts | 192,604
Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 238,727
Fair Market Value of foreign currency derivative contracts | 240,470
Euro [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 127,476
Fair Market Value of foreign currency derivative contracts | 128,608
Euro [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 46,433
Fair Market Value of foreign currency derivative contracts | 46,911
British Pound [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 34,612
Fair Market Value of foreign currency derivative contracts | 35,266
British Pound [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 38,391
Fair Market Value of foreign currency derivative contracts | 38,779
Japanese Yen [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 22,762
Fair Market Value of foreign currency derivative contracts | 22,865
Japanese Yen [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 16,351
Fair Market Value of foreign currency derivative contracts | 16,266
Australian Dollar [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 376
Fair Market Value of foreign currency derivative contracts | 379
Australian Dollar [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 7,519
Fair Market Value of foreign currency derivative contracts | 7,679
Hong Kong Dollar [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 82,435
Fair Market Value of foreign currency derivative contracts | 82,321
Singapore Dollar [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 1,155
Fair Market Value of foreign currency derivative contracts | 1,159
Singapore Dollar [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 11,497
Fair Market Value of foreign currency derivative contracts | 11,580
Others [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 4,268
Fair Market Value of foreign currency derivative contracts | 4,327
Others [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 36,101
Fair Market Value of foreign currency derivative contracts | $ 36,934

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