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Summary of Significant Accounting Policies - Revenue Recognition (Details) $ in Thousands	2 Months Ended	3 Months Ended								10 Months Ended	12 Months Ended
	Mar. 02, 2019 USD ($)	Mar. 02, 2019 USD ($)	Dec. 01, 2018 USD ($)	Sep. 01, 2018 USD ($)	Jun. 02, 2018 USD ($)	Mar. 03, 2018 USD ($)	Dec. 02, 2017 USD ($)	Sep. 02, 2017 USD ($)	Jun. 03, 2017 USD ($)	Dec. 31, 2017	Mar. 02, 2019 USD ($) Point	Mar. 03, 2018 USD ($)	Mar. 04, 2017 USD ($)	Mar. 04, 2018 USD ($)	Feb. 27, 2016 USD ($)
Intangible Assets
Estimated Useful Life											10 years
Estimated useful life of purchased prescription files acquired in other than business combinations											5 years
Deferred Financing Costs
Amortization expenses of deferred financing costs											$ 10,761	$ 8,403	$ 4,696
Revenue Recognition
Revenues		$ 5,379,645	$ 5,450,060	$ 5,421,362	$ 5,388,490	$ 5,394,264	$ 5,353,170	$ 5,345,011	$ 5,436,523		21,639,557	21,528,968	22,927,540
Accounts receivable, net	$ 1,788,712	1,788,712				1,869,100					1,788,712	1,869,100		$ 1,811,203
Inventories, net	1,871,941	1,871,941				1,799,539					1,871,941	1,799,539		1,850,660
Deferred tax assets	409,084	409,084				594,019					409,084	594,019		592,235
Total assets	7,591,367	7,591,367				8,989,327					7,591,367	8,989,327		8,980,767
Accumulated deficit	(4,713,244)	(4,713,244)				(4,282,471)					(4,713,244)	(4,282,471)		(4,291,031)
Total stockholders' equity	$ 1,186,690	1,186,690				1,601,010					1,186,690	1,601,010	614,070	1,592,450	$ 581,428
Advertising
Advertising expenses, net of vendor advertising allowances											$ 147,519	$ 161,826	$ 181,438
Income Taxes
Federal statutory rate (as a percent)	21.00%									35.00%	21.00%	32.60%	35.00%
Difference between Revenue Guidance in Effect before and after Topic 606
Revenue Recognition
Accounts receivable, net														(57,897)
Inventories, net														51,121
Deferred tax assets														(1,784)
Total assets														(8,560)
Accumulated deficit														(8,560)
Total stockholders' equity														(8,560)
Intersegment elimination
Revenue Recognition
Revenues											$ (211,283)	$ (200,326)	$ (232,964)
Accounts receivable, net	$ 14,459	14,459				16,256					14,459	16,256
Total assets	(14,459)	(14,459)				(54,969)					$ (14,459)	$ (54,969)
Trade names
Intangible Assets
Finite-lived intangible assets amortization period											10 years
Customer relationships
Intangible Assets
Finite-lived intangible assets amortization period											13 years	15 years
CMS license
Intangible Assets
Finite-lived intangible assets amortization period											22 years	23 years
CMS license \| EnvisionRx
Intangible Assets
Finite-lived intangible assets amortization period											25 years
Minimum
Insurance
Workers compensation occurrences	1,000	1,000									$ 1,000
General liability occurrences	3,000	3,000									$ 3,000
Minimum \| Customer relationships \| EnvisionRx
Intangible Assets
Finite-lived intangible assets amortization period											10 years
Maximum \| Customer relationships \| EnvisionRx
Intangible Assets
Finite-lived intangible assets amortization period											20 years
Buildings \| Minimum
Property, Plant and Equipment
Useful life											30 years
Buildings \| Maximum
Property, Plant and Equipment
Useful life											45 years
Equipment \| Minimum
Property, Plant and Equipment
Useful life											3 years
Equipment \| Maximum
Property, Plant and Equipment
Useful life											15 years
Internal-use software
Property, Plant and Equipment
Capitalized costs											$ 13,716	$ 13,940	6,189
Retail Pharmacy
Revenue Recognition
Number of points awarded for each dollar spent towards front end merchandise \| Point											1
Number of points awarded for each qualifying prescription \| Point											25
Accumulated number of points in a calendar year to achieve the "Gold" tier \| Point											1,000
Percentage discount on qualifying purchases of front end merchandise on achieving "Gold" tier											20.00%
Accrued contract liabilities	63,720	63,720				63,851					$ 63,720	63,851
Accrued contract liabilities included in other current liabilities	51,042	51,042				50,036					51,042	50,036
Accrued contract liabilities included in noncurrent liabilities	$ 12,678	$ 12,678				$ 13,815					$ 12,678	13,815
Expiration window to redeem accumulated Bonus Cash (in days)											60 days
Revenues											$ 15,757,152	15,832,625	16,766,620
Retail Pharmacy \| Other
Revenue Recognition
Revenues											150,461	155,636	155,788
Pharmacy sales
Revenue Recognition
Revenues											10,391,539	10,328,376	11,072,480
Front end sales
Revenue Recognition
Revenues											5,215,152	5,348,613	5,538,352
Pharmacy Services
Revenue Recognition
Revenues											$ 6,093,688	$ 5,896,669	$ 6,393,884
Vendor Rebates and Allowances and Purchase Discounts
Period for rebates are dispensed to manufacturers											30 days
Accounting Standards Update 2016-09
Revenue Recognition
Accounts receivable, net														(57,897)
Inventories, net														51,121
Accumulated deficit														$ (8,560)