Convertible Notes Payable (Tables)

9 Months Ended

Jul. 31, 2011

Convertible Notes Payable [Abstract]

Carrying value and estimated current fair value of outstanding convertible notes

	July 31, 2011
Description	Carrying Value		Fair Value
0.25% Convertible Senior Notes due May 1, 2013	$	216,210	$	209,048
4.0% Convertible Senior Notes due March 15, 2015 (1)		376,239		410,156
0.875% Convertible Senior Notes due June 15, 2017		500,000		406,875
3.75% Convertible Senior Notes due October 15, 2018		350,000		370,125
	$	1,442,449	$	1,396,204

⁽¹⁾   Includes unamortized bond premium related to embedded redemption feature