Comprehensive Income (Components Of Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2012	Apr. 30, 2011
Comprehensive Income [Abstract]
Net income	$ 20,971	$ 81,114	$ 77,665	$ 129,340
Change in unrealized (losses) gains on investments, net of tax of $117 and $58, for the three and six months ended April 30, 2012, respectively, and of $(54) and $114, for the three and six months ended April 30, 2011	(179)	(24)	(88)	(177)
Deferred gains (losses) on cash flow hedges, net of tax of $(549) and $381, for the three and six months ended April 30, 2012, respectively, and of ($1,941) and $(1,862) for each of the same periods in fiscal 2011, respectively	4,586	7,776	(120)	8,815
Reclassification adjustment on deferred (gains) losses on cash flow hedges, net of tax of $(605) and $(1,593), for the three and six months ended April 30, 2012, respectively, and of $(81) and $(942) for each of the same periods in fiscal 2011, respectively	2,117	984	5,570	4,642
Foreign currency translation adjustment	(5,010)	5,082	(7,059)	3,123
Total	22,485	94,932	75,968	145,743
Change in unrealized gains (losses) on investments, net of tax	117	(54)	58	114
Deferred gains (losses) on cash flow hedges, net of tax	(549)	(1,941)	381	(1,862)
Reclassification adjustment on deferred (gains) losses on cash flow hedges, net of tax	$ (605)	$ (81)	$ (1,593)	$ (942)