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Supplemental Financial Information (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
May 31, 2013
May 31, 2013
May 31, 2012
May 31, 2013
5.50% Senior Notes Due 2014 [Member]
May 31, 2013
5.60% Senior Notes Due 2015 [Member]
May 31, 2013
6.50% Senior Notes Due 2016 [Member]
May 31, 2013
12.25% Senior Notes Due 2017 [Member]
May 31, 2013
4.75% Senior Notes Due 2017 [Member]
May 31, 2013
6.95% Senior Notes Due 2018 [Member]
May 31, 2013
4.125% Senior Notes Due 2018 [Member]
Feb. 28, 2013
4.125% Senior Notes Due 2018 [Member]
May 31, 2013
2.00% Convertible Senior Notes Due 2020 [Member]
May 31, 2010
2.00% Convertible Senior Notes Due 2020 [Member]
May 31, 2013
2.75% Convertible Senior Notes Due 2020 [Member]
Nov. 30, 2010
2.75% Convertible Senior Notes Due 2020 [Member]
May 31, 2013
3.25% Convertible Senior Notes Due 2021 [Member]
Nov. 30, 2011
3.25% Convertible Senior Notes Due 2021 [Member]
May 31, 2013
4.750% Senior Notes Due 2022 [Member]
Nov. 30, 2012
4.750% Senior Notes Due 2022 [Member]
May 31, 2013
Letter Of Credit Agreement 3 [Member]
Condensed Financial Statements, Captions [Line Items]                                        
Deferred Income Tax Expense (Benefit)   $ 6,174 $ (403,012)                                  
Interest rate       5.50% 5.60% 6.50% 12.25% 4.75% 6.95% 4.125% 4.125% 2.00% 2.00% 2.75% 2.75% 3.25% 3.25% 4.75% 4.75%  
Guarantee by subsidiaries 75,000                                      
Line of credit facility current borrowing capacity                                       $ 200,000