Goodwill and Other Intangible Assets (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Aug. 29, 2015	Aug. 30, 2014	Aug. 29, 2015	Aug. 30, 2014	Feb. 28, 2015
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	$ 2,932,905		$ 2,932,905		$ 2,093,531
Accumulated Amortization	(1,751,374)		(1,751,374)		(1,672,051)
Net	1,181,531		1,181,531		421,480
Gross Carrying Amount, Total	2,976,905		2,976,905		2,093,531
Net, Total	1,225,531		1,225,531		421,480
Unfavorable lease intangibles	51,382		51,382		55,571
Amortization expense for intangible assets and liabilities	48,609	$ 28,532	80,550	$ 57,769
Anticipated annual amortization expense for intangible assets and liabilities
2016	186,283		186,283
2017	206,363		206,363
2018	166,250		166,250
2019	130,231		130,231
2020	100,716		100,716
Trademarks
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Indefinite Lived	44,000		44,000
Favorable leases and other
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	663,323		663,323		653,377
Accumulated Amortization	(498,624)		(498,624)		(481,041)
Net	164,699		$ 164,699		$ 172,336
Remaining Weighted Average Amortization Period			8 years		8 years
Prescription files
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	1,470,997		$ 1,470,997		$ 1,440,154
Accumulated Amortization	(1,235,710)		(1,235,710)		(1,191,010)
Net	235,287		$ 235,287		$ 249,144
Remaining Weighted Average Amortization Period			3 years		3 years
Customer relationships
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	585,500		$ 585,500
Accumulated Amortization	(12,769)		(12,769)
Net	572,731		$ 572,731
Remaining Weighted Average Amortization Period			17 years
CMS license
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	108,000		$ 108,000
Accumulated Amortization	(792)		(792)
Net	107,208		$ 107,208
Remaining Weighted Average Amortization Period			25 years
Claims adjudication and other developed software
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	59,500		$ 59,500
Accumulated Amortization	(1,558)		(1,558)
Net	57,942		$ 57,942
Remaining Weighted Average Amortization Period			7 years
Trademarks
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	15,600		$ 15,600
Accumulated Amortization	(286)		(286)
Net	15,314		$ 15,314
Remaining Weighted Average Amortization Period			10 years
Backlog
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	12,500		$ 12,500
Accumulated Amortization	(764)		(764)
Net	11,736		$ 11,736
Remaining Weighted Average Amortization Period			3 years
Other
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	17,485		$ 17,485
Accumulated Amortization	(871)		(871)
Net	$ 16,614		$ 16,614
Remaining Weighted Average Amortization Period			5 years