Leases - Maturity of lease liabilities under finance and operating leases (Details) $ in Thousands	Nov. 30, 2019 USD ($)
Finance Leases, ASC842
2020 (remaining twenty-six weeks)	$ 6,340
2021	10,082
2022	4,191
2023	3,897
2024	3,655
Thereafter	17,765
Total lease payments	45,930
Less: imputed interest	(15,837)
Total finance lease liabilities, ASC842	30,093
Operating Leases, ASC842
2020 (remaining twenty-six weeks)	172,032
2021	654,569
2022	594,498
2023	538,707
2024	475,406
Thereafter	1,644,650
Total lease payments	4,079,862
Less: imputed interest	(853,824)
Total operating lease liabilities	3,226,038
Minimum sublease rentals	50,000
Operating and finance leases, ASC842
2020 (remaining thirty-nine weeks)	178,372
2021	664,651
2022	598,689
2023	542,604
2024	479,061
Thereafter	1,662,415
Total lease payments	4,125,792
Less: imputed interest	(869,661)
Total lease liabilities	$ 3,256,131