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Segment Reporting - Balance Sheet information (Details) $ in Thousands	12 Months Ended
	Mar. 02, 2019 USD ($) segment	Mar. 03, 2018 USD ($)	Mar. 04, 2018 USD ($)	Mar. 04, 2017 USD ($)
Segment Reporting
Number of reportable segments \| segment	2
Total assets	$ 7,591,367	$ 8,989,327	$ 8,980,767
Goodwill	1,108,136	1,421,120		$ 1,682,847
Additions to property and equipment and intangible assets	244,689	214,764
Accounts receivable	1,788,712	1,869,100	$ 1,811,203
Retail Pharmacy
Segment Reporting
Goodwill	43,492	43,492		43,492
Pharmacy Services
Segment Reporting
Goodwill	1,064,644	1,377,628		$ 1,639,355
Operating segments \| Retail Pharmacy
Segment Reporting
Total assets	5,071,055	6,089,343
Goodwill	43,492	43,492
Additions to property and equipment and intangible assets	228,079	199,437
Operating segments \| Pharmacy Services
Segment Reporting
Total assets	2,534,771	2,954,953
Goodwill	1,064,644	1,377,628
Additions to property and equipment and intangible assets	16,610	15,327
Intersegment elimination
Segment Reporting
Total assets	(14,459)	(54,969)
Long-term deferred tax liability	0	38,713
Accounts receivable	$ 14,459	$ 16,256