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Accumulated Other Comprehensive Income (Loss) - Effect of Amounts Reclassified out of Each Component of Accumulated Other Comprehensive Income (Loss) into Net Income (Detail) - Reclassification out of accumulated other comprehensive income (loss) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2018 | Apr. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassifications into net income | $ 5,542 | $ (1,738) | $ 10,848 | $ (5,592)
Revenues | Gain (loss) on cash flow hedges, net of taxes |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassifications into net income | (169) | (428) | 1,498 | (2,181)
Operating expenses | Gain (loss) on cash flow hedges, net of taxes |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassifications into net income | 5,711 | (1,310) | 9,350 | (3,412)
Other income (expense) | Gain (loss) on available-for-sale securities |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassifications into net income | $ 0 | $ 0 | $ 0 | $ 1

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