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Financial Instruments - Outstanding Currency, Forward Exchange Contracts (Detail) $ in Thousands | Jul. 31, 2018 USD ($)
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Derivative [Line Items] |
Fair Value of foreign currency derivative contracts | $ (239)
Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 309,173
Fair Value of foreign currency derivative contracts | 306,350
Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 508,455
Fair Value of foreign currency derivative contracts | 505,344
Euro [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 239,642
Fair Value of foreign currency derivative contracts | 237,535
Euro [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 201,296
Fair Value of foreign currency derivative contracts | 200,285
British Pound [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 41,649
Fair Value of foreign currency derivative contracts | 41,182
British Pound [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 70,644
Fair Value of foreign currency derivative contracts | 69,429
Japanese Yen [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 22,872
Fair Value of foreign currency derivative contracts | 22,641
Japanese Yen [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 43,591
Fair Value of foreign currency derivative contracts | 43,113
Australian Dollar [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 185
Fair Value of foreign currency derivative contracts | 186
Australian Dollar [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 7,729
Fair Value of foreign currency derivative contracts | 7,677
Hong Kong Dollar [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 453
Fair Value of foreign currency derivative contracts | 452
Hong Kong Dollar [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 118,507
Fair Value of foreign currency derivative contracts | 118,369
Singapore Dollar [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 613
Fair Value of foreign currency derivative contracts | 603
Singapore Dollar [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 12,820
Fair Value of foreign currency derivative contracts | 12,635
Others [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 3,759
Fair Value of foreign currency derivative contracts | 3,751
Others [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 53,868
Fair Value of foreign currency derivative contracts | $ 53,836

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