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Summary of Significant Accounting Policies - Sales (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 29, 2020	Nov. 30, 2019	Aug. 31, 2019	Jun. 01, 2019	Mar. 02, 2019	Dec. 01, 2018	Sep. 01, 2018	Jun. 02, 2018	Feb. 29, 2020	Mar. 02, 2019	Mar. 03, 2018
Product Class
Total revenue	$ 5,727,242	$ 5,462,298	$ 5,366,264	$ 5,372,589	$ 5,379,645	$ 5,450,060	$ 5,421,362	$ 5,388,490	$ 21,928,393	$ 21,639,557	$ 21,528,968
Intersegment elimination
Product Class
Total revenue									(247,353)	(211,283)	(200,326)
Retail Pharmacy
Product Class
Other revenue									146,917	150,461	155,636
Total revenue									$ 15,616,186	$ 15,757,152	$ 15,832,625
Retail Pharmacy \| Prescription drugs \| Revenue from Contract with Customer, Segment Benchmark [Member]
Product Class
Percentage of sales									67.00%	66.60%	65.90%
Retail Pharmacy \| Over-the-counter medications and personal care \| Revenue from Contract with Customer, Segment Benchmark [Member]
Product Class
Percentage of sales									11.00%
Retail Pharmacy \| Health and beauty aids \| Revenue from Contract with Customer, Segment Benchmark [Member]
Product Class
Percentage of sales									5.00%
Retail Pharmacy \| General merchandise and other \| Revenue from Contract with Customer, Segment Benchmark [Member]
Product Class
Percentage of sales									17.00%
Pharmacy sales
Product Class
Revenue from contract with customer									$ 10,354,293	$ 10,391,539	$ 10,328,376
Front end sales
Product Class
Revenue from contract with customer									5,114,976	5,215,152	5,348,613
Pharmacy Services
Product Class
Total revenue									$ 6,559,560	$ 6,093,688	$ 5,896,669