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Financial Instruments - Outstanding Currency, Forward Exchange Contracts (Detail) $ in Thousands | Jul. 31, 2016 USD ($)
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Derivative [Line Items] |
Fair Market Value of foreign currency derivative contracts | $ 26
Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 244,392
Fair Market Value of foreign currency derivative contracts | 244,614
Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 232,246
Fair Market Value of foreign currency derivative contracts | 232,493
Euro [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 171,701
Fair Market Value of foreign currency derivative contracts | 171,084
Euro [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 53,474
Fair Market Value of foreign currency derivative contracts | 53,745
British Pound [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 39,512
Fair Market Value of foreign currency derivative contracts | 39,281
British Pound [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 38,273
Fair Market Value of foreign currency derivative contracts | 36,661
Japanese Yen [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 27,364
Fair Market Value of foreign currency derivative contracts | 28,406
Japanese Yen [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 15,907
Fair Market Value of foreign currency derivative contracts | 16,537
Australian Dollar [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 709
Fair Market Value of foreign currency derivative contracts | 722
Australian Dollar [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 7,560
Fair Market Value of foreign currency derivative contracts | 7,884
Hong Kong Dollar [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 76,022
Fair Market Value of foreign currency derivative contracts | 76,011
Singapore Dollar [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 1,186
Fair Market Value of foreign currency derivative contracts | 1,219
Singapore Dollar [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 11,870
Fair Market Value of foreign currency derivative contracts | 12,181
Others [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 3,920
Fair Market Value of foreign currency derivative contracts | 3,902
Others [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 29,140
Fair Market Value of foreign currency derivative contracts | $ 29,474

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