Long-Term Debt - Summary of Long-Term Debt Carrying Values Including Unamortized Discounts and Premiums (Detail) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2013	Nov. 30, 2012
Debt Disclosure [Line Items]
Long-term debt	$ 5,711,751	$ 4,804,607
Unsecured debt [Member]
Debt Disclosure [Line Items]
Long-term debt	5,451,751	4,454,600
5.875% Senior Notes, due 2014 [Member] | Unsecured debt [Member]
Debt Disclosure [Line Items]
Long-term debt	249,633	249,564
3.875% Senior Note, due 2015 [Member] | Unsecured debt [Member]
Debt Disclosure [Line Items]
Long-term debt	499,431	499,382
5.5% Senior Notes, due 2016 [Member] | Unsecured debt [Member]
Debt Disclosure [Line Items]
Long-term debt	349,301	349,248
5.125% Senior Notes, due 2018 [Member] | Unsecured debt [Member]
Debt Disclosure [Line Items]
Long-term debt	772,588	771,450
8.5% Senior Notes, due 2019 [Member] | Unsecured debt [Member]
Debt Disclosure [Line Items]
Long-term debt	706,782	706,990
6.875% Senior Note, due 2021 [Member] | Unsecured debt [Member]
Debt Disclosure [Line Items]
Long-term debt	744,079	743,945
2.25% Euro Medium Term Notes, due 2022 [Member] | Unsecured debt [Member]
Debt Disclosure [Line Items]
Long-term debt	3,756	3,708
6.45% Senior Debentures, due 2027 [Member] | Unsecured debt [Member]
Debt Disclosure [Line Items]
Long-term debt	346,825	346,792
5.125% Senior Notes, due 2023 [Member] | Unsecured debt [Member]
Debt Disclosure [Line Items]
Long-term debt	598,340
6.50% Senior Notes, due 2043 [Member] | Unsecured debt [Member]
Debt Disclosure [Line Items]
Long-term debt	395,166
3.875% Convertible Senior Debentures, due 2029 [Member] | Unsecured debt [Member]
Debt Disclosure [Line Items]
Long-term debt	292,912	290,617
6.25% Senior Debentures, due 2036 [Member] | Unsecured debt [Member]
Debt Disclosure [Line Items]
Long-term debt	492,938	492,904
Credit facility, due 2014 [Member] | Secured debt [Member]
Debt Disclosure [Line Items]
Long-term debt	$ 260,000	$ 350,007