Long-Term Debt (Tables)

12 Months Ended

Nov. 30, 2011

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

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

	November 30,
	2011		2010
Unsecured Long-Term Debt
7.75% Senior Notes, due 2012 (effective interest rate of 8.08%)(1)	$	254,926	$	305,969
5.875% Senior Notes, due 2014 (effective interest rate of 6.00%)		249,298		249,048
3.875% Senior Notes, due 2015 (effective interest rate of 3.92%)		499,187		499,000
5.5% Senior Notes, due 2016 (effective interest rate of 5.57%)		349,045		348,854
5.125% Senior Notes, due 2018 (effective interest rate of 5.18%)		782,598		—
8.5% Senior Notes, due 2019 (effective interest rate of 8.31%)		707,787		708,529
6.875% Senior Notes, due 2021 (effective interest rate of 6.99%)		545,816		545,510
6.45% Senior Debentures, due 2027 (effective interest rate of 6.55%)		346,664		346,544
3.875% Convertible Senior Debentures, due, 2029 (effective interest rate of 7.20%)		280,832		282,577
6.25% Senior Debentures, due 2036 (effective interest rate of 6.37%)		492,773		492,650
	$	4,508,926	$	3,778,681
Secured Long-Term Debt
Credit facility, due 2014		100,000		—
	$	4,608,926	$	3,778,681

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