Indebtedness and Credit Agreements (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				3 Months Ended		3 Months Ended									3 Months Ended			3 Months Ended								3 Months Ended					0 Months Ended
	May 31, 2014	Mar. 01, 2014	May 31, 2014 Senior secured credit facility	Mar. 01, 2014 Senior secured credit facility	May 31, 2014 Senior secured revolving credit facility due February 2018	Mar. 01, 2014 Senior secured revolving credit facility due February 2018	May 31, 2014 Senior secured revolving credit facility due February 2018 Minimum	May 31, 2014 Senior secured revolving credit facility due February 2018 Maximum	May 31, 2014 Senior secured revolving credit facility due February 2018 LIBOR	May 31, 2014 Senior secured revolving credit facility due February 2018 LIBOR Minimum	May 31, 2014 Senior secured revolving credit facility due February 2018 LIBOR Maximum	May 31, 2014 Senior secured revolving credit facility due February 2018 Citibank's base rate	May 31, 2014 Senior secured revolving credit facility due February 2018 Citibank's base rate Minimum	May 31, 2014 Senior secured revolving credit facility due February 2018 Citibank's base rate Maximum	Mar. 01, 2014 Tranche 6 Term Loan due February 2020	May 31, 2014 Tranche 6 Term Loan due February 2020 LIBOR	May 31, 2014 Tranche 7 Term Loan due February 2020	Mar. 14, 2014 Tranche 7 Term Loan due February 2020	May 31, 2014 Tranche 7 Term Loan due February 2020 LIBOR	May 31, 2014 Tranche 7 Term Loan due February 2020 Citibank's base rate	May 31, 2014 10.25% senior secured notes (second lien) due October 2019 ($270,000 face value less unamortized discount of $1,109 and $1,160)	Mar. 01, 2014 10.25% senior secured notes (second lien) due October 2019 ($270,000 face value less unamortized discount of $1,109 and $1,160)	May 31, 2014 8.00% senior secured notes (senior lien) due August 2020	Mar. 01, 2014 8.00% senior secured notes (senior lien) due August 2020	May 31, 2014 Tranche 1 Term Loan (second lien) due August 2020	Mar. 01, 2014 Tranche 1 Term Loan (second lien) due August 2020	May 31, 2014 Tranche 1 Term Loan (second lien) due August 2020 LIBOR	May 31, 2014 Tranche 1 Term Loan (second lien) due August 2020 Citibank's base rate	May 31, 2014 Tranche 2 Term Loan (second lien) due June 2021	Mar. 01, 2014 Tranche 2 Term Loan (second lien) due June 2021	Jun. 21, 2013 Tranche 2 Term Loan (second lien) due June 2021	Jun. 21, 2013 Tranche 2 Term Loan (second lien) due June 2021 LIBOR	Jun. 21, 2013 Tranche 2 Term Loan (second lien) due June 2021 Citibank's base rate	May 31, 2014 Other secured	Mar. 01, 2014 Other secured	May 31, 2014 Guaranteed Unsecured Debt	Mar. 01, 2014 Guaranteed Unsecured Debt	May 31, 2014 9.25% senior notes due March 2020	Mar. 01, 2014 9.25% senior notes due March 2020	May 31, 2014 6.75% senior notes due June 2021	Mar. 01, 2014 6.75% senior notes due June 2021	May 31, 2014 Unguaranteed Unsecured Debt	Mar. 01, 2014 Unguaranteed Unsecured Debt	May 31, 2014 8.5% convertible notes due May 2015	Mar. 01, 2014 8.5% convertible notes due May 2015	May 31, 2014 7.7% notes due February 2027	Mar. 01, 2014 7.7% notes due February 2027	May 31, 2014 6.875% fixed-rate senior notes due December 2028	Mar. 01, 2014 6.875% fixed-rate senior notes due December 2028
Indebtedness and credit agreement
Long-term debt			$ 3,397,509	$ 3,446,457	$ 351,000	$ 400,000									$ 1,152,293		$ 1,152,293				$ 268,891	$ 268,840	$ 650,000	$ 650,000	$ 470,000	$ 470,000			$ 500,000	$ 500,000				$ 5,325	$ 5,324	$ 1,715,919	$ 1,716,087	$ 905,919	$ 906,087	$ 810,000	$ 810,000	$ 487,188	$ 487,188	$ 64,188	$ 64,188	$ 295,000	$ 295,000	$ 128,000	$ 128,000
Lease financing obligations	103,770	107,411
Total debt	5,704,386	5,757,143
Current maturities of long-term debt and lease financing obligations	(112,818)	(49,174)
Long-term debt and lease financing obligations, less current maturities	5,591,568	5,707,969
Face value																		1,152,293			270,000	270,000									500,000							902,000	902,000
Unamortized discount																					1,109	1,160
Unamortized premium																																						3,919	4,087
Debt instrument, stated interest rate (as a percent)																					10.25%	10.25%	8.00%	8.00%														9.25%	9.25%	6.75%	6.75%			8.50%	8.50%	7.70%	7.70%	6.875%	6.875%
Credit facility
Revolving credit facility					1,795,000													1,152,293
Reference rate for variable interest rate	LIBOR								LIBOR			Citibank's base rate				LIBOR			LIBOR	Citibank's base rate							LIBOR	Citibank's base rate				LIBOR	Citibank's base rate
Percentage points added to the reference rate										2.25%	2.75%		1.25%	1.75%					2.75%	1.75%							4.75%	3.75%				3.875%	2.875%
Percentage of fee payable on daily unused revolver availability							0.375%	0.50%
LIBOR floor (as a percent)																			0.75%								1.00%					1.00%
Outstanding borrowings					351,000
Letters of credit outstanding					77,826
Additional borrowing capacity					1,366,174
Threshold availability on revolving credit facility to trigger fixed charge coverage requirements					150,000
Minimum fixed charge coverage ratio					1.00
Fixed charge coverage ratio							1.00
Ownership interest (as a percent)	100.00%
Maturities
Remainder of fiscal 2015	13,966
2016	75,711
2017	11,523
2018	362,523
2019	11,523
Thereafter	$ 5,122,560