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Financial Instruments - Outstanding Currency, Forward Exchange Contracts (Detail) $ in Thousands | Jul. 31, 2017 USD ($)
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Derivative [Line Items] |
Fair Market Value of foreign currency derivative contracts | $ (3,253)
Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 214,787
Fair Market Value of foreign currency derivative contracts | 221,367
Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 271,843
Fair Market Value of foreign currency derivative contracts | 275,188
Euro [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 146,936
Fair Market Value of foreign currency derivative contracts | 152,735
Euro [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 44,062
Fair Market Value of foreign currency derivative contracts | 45,146
British Pound [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 31,008
Fair Market Value of foreign currency derivative contracts | 31,479
British Pound [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 44,480
Fair Market Value of foreign currency derivative contracts | 45,238
Japanese Yen [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 31,211
Fair Market Value of foreign currency derivative contracts | 31,402
Japanese Yen [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 23,929
Fair Market Value of foreign currency derivative contracts | 23,991
Australian Dollar [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 589
Fair Market Value of foreign currency derivative contracts | 600
Australian Dollar [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 7,333
Fair Market Value of foreign currency derivative contracts | 7,863
Hong Kong Dollar [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 96,331
Fair Market Value of foreign currency derivative contracts | 95,880
Singapore Dollar [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 568
Fair Market Value of foreign currency derivative contracts | 591
Singapore Dollar [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 12,403
Fair Market Value of foreign currency derivative contracts | 12,701
Others [Member] | Foreign Currency Forward Contracts [Member] | Sell [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 4,475
Fair Market Value of foreign currency derivative contracts | 4,560
Others [Member] | Foreign Currency Forward Contracts [Member] | Buy [Member] |
Derivative [Line Items] |
Notional Amounts of foreign currency derivative contracts | 43,305
Fair Market Value of foreign currency derivative contracts | $ 44,369

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