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Indebtedness and Credit Agreements - Indebtedness and lease financing obligations (Details) - USD ($) $ in Thousands	Feb. 29, 2020	Feb. 05, 2020	Jan. 06, 2020	Nov. 30, 2019	Oct. 15, 2019	Oct. 11, 2019	Mar. 02, 2019	Dec. 20, 2018	Jun. 25, 2018	May 21, 2018	Apr. 19, 2018	Apr. 12, 2018	Mar. 29, 2018	Mar. 13, 2018	Feb. 27, 2018
Indebtedness and credit agreements
Lease financing obligations, ASC842	$ 28,166
Lease financing obligations, ASC840							$ 40,176
Total Debt	3,105,434						3,494,760
Current maturities of long-term debt and lease financing obligations	(8,840)						(16,111)
Long-term debt and lease financing obligations, less current maturities	3,096,594						3,478,649
Secured Debt
Indebtedness and credit agreements
Long-term debt	1,077,787						1,297,013
Senior secured revolving credit facility due December 2023
Indebtedness and credit agreements
Long-term debt	630,833						850,931
Principal amount of debt	650,000						875,000
Unamortized debt issuance costs	19,167						24,069
Senior secured term loan due December 2023
Indebtedness and credit agreements
Long-term debt	446,954						446,082
Principal amount of debt	450,000						450,000	$ 450,000
Unamortized debt issuance costs	3,046						3,918
Senior Notes 7.5 Percent [Member]
Indebtedness and credit agreements
Long-term debt	589,073
Debt instrument, stated interest rate (as a percent)		7.50%	7.50%
Guaranteed Unsecured Debt
Indebtedness and credit agreements
Long-term debt	1,145,060						1,736,508
9.25% senior notes due March 2020
Indebtedness and credit agreements
Debt instrument, stated interest rate (as a percent)												9.25%	9.25%	9.25%	9.25%
6.75% senior notes due June 2021
Indebtedness and credit agreements
Debt instrument, stated interest rate (as a percent)									6.75%	6.75%	6.75%		6.75%		6.75%
6.125% senior notes due April 2023
Indebtedness and credit agreements
Long-term debt	$ 1,145,060						$ 1,736,508
Debt instrument, stated interest rate (as a percent)	6.125%	6.125%	6.125%				6.125%	6.125%		6.125%	6.125%		6.125%		6.125%
Principal amount of debt	$ 1,153,490						$ 1,753,490
Unamortized debt issuance costs	8,430						16,982
Unguaranteed Unsecured Debt
Indebtedness and credit agreements
Long-term debt	265,348						421,063
7.7% notes due February 2027
Indebtedness and credit agreements
Long-term debt	$ 236,478						$ 293,705
Debt instrument, stated interest rate (as a percent)	7.70%			7.70%	7.70%	7.70%	7.70%
Principal amount of debt	$ 237,386						$ 295,000
Unamortized debt issuance costs	908						1,295
6.875% fixed-rate senior notes due December 2028
Indebtedness and credit agreements
Long-term debt	$ 28,870						$ 127,358
Debt instrument, stated interest rate (as a percent)	6.875%			6.875%	6.875%	6.875%	6.875%
Principal amount of debt	$ 29,001						$ 128,000
Unamortized debt issuance costs	$ 131						$ 642