Components Of Comprehensive Income (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Comprehensive Income (Loss) [Line Items]
Change in unrealized gains (losses) on investments, tax	$ 0	$ (9)	$ 58	$ 104
Deferred gains (losses) on cash flow hedges, tax	2,227	575	2,608	(1,287)
Reclassification adjustment on deferred (gains) losses on cash flow hedges, tax	$ (1,247)	$ 401	$ (2,840)	$ (541)