Long-Term Debt (Tables)

9 Months Ended

Aug. 31, 2011

Short-Term Borrowings/Long-Term Debt [Abstract]

Summary of long-term debt carrying values including unamortized discounts and premiums

	August 31,		November 30,
	2011		2010
7.75% Senior Notes, due 2012 (effective interest rate of 8.08%) (1)	$	305,232	$	305,969
5.875% Senior Notes, due 2014 (effective interest rate of 6.00%)		249,234		249,048
3.875% Senior Note, due 2015 (effective interest rate of 3.92%)		499,140		499,000
5.5% Senior Notes, due 2016 (effective interest rate of 5.57%)		348,997		348,854
5.125% Senior Notes, due 2018 (effective interest rate of 5.18%)		797,342		—
8.5% Senior Notes, due 2019 (effective interest rate of 8.31%)		707,977		708,529
6.875% Senior Note, due 2021 (effective interest rate of 6.99%)		545,737		545,510
6.45% Senior Debentures, due 2027 (effective interest rate of 6.55%)		346,633		346,544
3.875% Convertible Senior Debentures, due, 2029 (effective interest rate of 7.20%)		287,944		282,577
6.25% Senior Debentures, due 2036 (effective interest rate of 6.37%)		492,742		492,650
	$	4,580,978	$	3,778,681

(1) Our 7.75% Senior Notes, due in 2012, are payable in March 2012.