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Indebtedness and Credit Agreements - Indebtedness and lease financing obligations (Details) - USD ($) $ in Thousands	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
Indebtedness and credit agreements
Lease financing obligations, ASC842	$ 30,093
Lease financing obligations, ASC840				$ 40,176
Total Debt	3,596,354			3,494,760
Current maturities of long-term debt and lease financing obligations	(9,486)			(16,111)
Long-term debt and lease financing obligations, less current maturities	3,586,868			3,478,649
Secured Debt
Indebtedness and credit agreements
Long-term debt	1,561,317			1,297,013
Senior secured revolving credit facility due December 2023
Indebtedness and credit agreements
Long-term debt	1,114,567			850,931
Principal amount of debt	1,135,000			875,000
Unamortized debt issuance costs	20,433			24,069
Senior secured term loan due December 2023
Indebtedness and credit agreements
Long-term debt	446,750			446,082
Principal amount of debt	450,000			450,000	$ 450,000
Unamortized debt issuance costs	3,250			3,918
Guaranteed Unsecured Debt
Indebtedness and credit agreements
Long-term debt	1,739,633			1,736,508
9.25% senior notes due March 2020
Indebtedness and credit agreements
Debt instrument, stated interest rate (as a percent)									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%
6.125% senior notes due April 2023
Indebtedness and credit agreements
Long-term debt	$ 1,739,633			$ 1,736,508
Debt instrument, stated interest rate (as a percent)	6.125%			6.125%			6.125%	6.125%
Principal amount of debt	$ 1,753,490			$ 1,753,490
Unamortized debt issuance costs	13,857			16,982
Unguaranteed Unsecured Debt
Indebtedness and credit agreements
Long-term debt	265,311			421,063
7.7% notes due February 2027
Indebtedness and credit agreements
Long-term debt	$ 236,444			$ 293,705
Debt instrument, stated interest rate (as a percent)	7.70%	7.70%	7.70%	7.70%
Principal amount of debt	$ 237,386			$ 295,000
Unamortized debt issuance costs	942			1,295
6.875% fixed-rate senior notes due December 2028
Indebtedness and credit agreements
Long-term debt	$ 28,867			$ 127,358
Debt instrument, stated interest rate (as a percent)	6.875%	6.875%	6.875%	6.875%
Principal amount of debt	$ 29,001			$ 128,000
Unamortized debt issuance costs	$ 134			$ 642