Accumulated Other Comprehensive Income (Loss) - Effect of Amounts Reclassified out of Each Component of Accumulated Other Comprehensive Income (Loss) into Net Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenues	$ 557,204	$ 517,697	$ 1,099,247	$ 996,648
Other income (expense)	7,957	4,225	13,073	15,253
Net income	55,596	63,317	120,785	131,013
Reclassification out of accumulated other comprehensive income (loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	(6,366)	(874)	(7,410)	2,432
Gain (loss) on cash flow hedges, net of taxes | Reclassification out of accumulated other comprehensive income (loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenues	26	(1,083)	2,406	1,674
Operating expenses	(6,397)	209	(9,833)	758
Gain (loss) on available-for-sale securities | Reclassification out of accumulated other comprehensive income (loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense)	$ 5	$ 0	$ 17	$ 0