Segment Reporting - Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 27, 2021	Nov. 28, 2020	Nov. 27, 2021	Nov. 28, 2020
Segment Reporting
Revenues	$ 6,228,880	$ 6,117,038	$ 18,502,865	$ 18,126,384
Gross Profit	1,334,383	1,203,099	3,865,182	3,561,763
Adjusted EBITDA from continuing operations	154,793	137,405	399,830	396,400
Additions to property and equipment and intangible assets	49,455	70,435	169,290	156,092
Retail Pharmacy
Segment Reporting
Revenues	4,432,508	4,109,592	13,061,408	12,250,775
Operating segments | Retail Pharmacy
Segment Reporting
Revenues	4,432,508	4,109,592	13,061,408	12,250,775
Gross Profit	1,233,237	1,079,708	3,543,533	3,223,157
Adjusted EBITDA from continuing operations	125,931	88,557	290,214	273,879
Additions to property and equipment and intangible assets	44,501	67,727	155,942	146,455
Operating segments | Pharmacy Services
Segment Reporting
Revenues	1,858,830	2,084,402	5,629,325	6,100,026
Gross Profit	101,146	123,391	321,649	338,606
Adjusted EBITDA from continuing operations	28,862	48,848	109,616	122,521
Additions to property and equipment and intangible assets	4,954	2,708	13,348	9,637
Intersegment elimination
Segment Reporting
Revenues	$ (62,458)	$ (76,956)	$ (187,868)	$ (224,417)