Leases - Maturity of lease liabilities under finance and operating leases (Details) - USD ($) $ in Thousands	May 30, 2020	Feb. 29, 2020
Finance Leases, ASC842
2021	$ 10,225
2022	4,078
2023	3,876
2024	3,597
2025	3,280
Thereafter	15,914
Total lease payments	40,970
Less: imputed interest	(14,314)
Total finance lease liabilities, ASC842	26,656	$ 28,166
Operating Leases, ASC842
2021	500,821
2022	625,642
2023	573,793
2024	512,399
2025	414,314
Thereafter	1,382,115
Total lease payments	4,009,084
Less: imputed interest	(823,953)
Total operating lease liabilities	3,185,131	$ 3,200,508
Minimum sublease rentals	44,000
Operating and finance leases, ASC842
2021	511,046
2022	629,720
2023	577,669
2024	515,996
2025	417,594
Thereafter	1,398,029
Total lease payments	4,050,054
Less: imputed interest	(838,267)
Total lease liabilities	$ 3,211,787