Asset Sale to WBA (Details) $ in Thousands			1 Months Ended	3 Months Ended		6 Months Ended
	Sep. 13, 2018 USD ($) store facility	Sep. 18, 2017 USD ($) item store	Mar. 31, 2018 USD ($) store	Aug. 31, 2019 USD ($)	Sep. 01, 2018 USD ($)	Aug. 31, 2019 USD ($)	Sep. 01, 2018 USD ($)	Mar. 03, 2019 USD ($)	Mar. 02, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts receivable, net				$ 1,945,600		$ 1,945,600		$ 1,788,712	$ 1,788,712
Walgreens Boots Alliance WBA [Member] | Walgreens
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest (as a percent)		100.00%
Assets held for sale | Sale Of Assets To Walgreens Boots Alliance WBA And Buyer [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of stores | store		1,932
Number of distribution centers	2	3
Purchase price per Agreement		$ 4,375,000
Discontinued Operations, Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts receivable, net					$ 385,936		$ 385,936
Discontinued Operations, Disposed of by Sale [Member] | Sale Of Assets To Walgreens Boots Alliance WBA And Buyer [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of stores | store			1,932
Number of distribution centers | facility	1
Proceeds from assets sold	$ 61,251		$ 4,156,686
Pre-tax gain on sale	$ 14,151
Period of transition		3 years
Payments for inventory and selling, general and administrative activities				913,965	1,835,484	2,106,756	3,876,559
Accounts receivable, net				196,002		196,002
TSA fees				$ 11,308	$ 23,213	$ 25,533	$ 46,948