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Segment Reporting - Balance Sheet information (Details) $ in Thousands	12 Months Ended
	Feb. 29, 2020 USD ($) segment	Mar. 02, 2019 USD ($)	Mar. 04, 2018 USD ($)	Mar. 03, 2018 USD ($)
Segment Reporting
Number of reportable segments \| segment	2
Total assets	$ 9,452,369	$ 7,591,367	$ 8,980,767	$ 8,989,327
Goodwill	1,108,136	1,108,136		1,421,120
Accounts receivable	1,286,785	1,788,712	$ 1,811,203	1,869,100
Retail Pharmacy
Segment Reporting
Goodwill	43,492	43,492		43,492
Pharmacy Services
Segment Reporting
Goodwill	1,064,644	1,064,644		$ 1,377,628
Operating segments \| Retail Pharmacy
Segment Reporting
Total assets	6,757,196	5,071,055
Goodwill	43,492	43,492
Operating segments \| Pharmacy Services
Segment Reporting
Total assets	2,709,737	2,534,771
Goodwill	1,064,644	1,064,644
Intersegment elimination
Segment Reporting
Total assets	(14,564)	(14,459)
Long-term deferred tax liability	0	0
Accounts receivable	$ 14,564	$ 14,459