Components Of Comprehensive Income (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 [Abstract]
Net income	$ 75,656	$ 52,082	$ 153,321	$ 181,422
Change in unrealized (losses) gains on investments, net of tax of $0 and $58, for the three and nine months ended July 31, 2012, respectively, and of $(9) and $104, for the same periods ended July 31, 2011, respectively		14	(88)	(163)
Deferred gains (losses) on cash flow hedges, net of tax of $2,227 and $2,608, for the three and nine months ended July 31, 2012, respectively, and of $575 and $(1,287), for the same periods ended July 31, 2011, respectively	(10,100)	(3,646)	(10,221)	5,169
Reclassification adjustment on deferred (gains) losses on cash flow hedges, net of tax of $(1,247) and $(2,840), for the three and nine months ended July 31, 2012, respectively, and of $401 and $(541), for the same periods ended July 31, 2011, respectively	3,890	(1,731)	9,460	2,910
Foreign currency translation adjustment	(2,871)	3,194	(9,929)	6,318
Total	$ 66,575	$ 49,913	$ 142,543	$ 195,656