Multiemployer Plans that Provide Pension Benefits (Details) (USD $)	12 Months Ended
	Mar. 02, 2013	Mar. 03, 2012	Feb. 26, 2011
Multiemployer Plans that Provide Pension Benefits
Contributions by employer	$ 19,787,000	$ 14,594,000	$ 19,053,000
Minimum
Multiemployer Plans that Provide Pension Benefits
Company listed in these plan's Forms 5500 as providing more than specified percentage of the total contributions	5.00%
1199 SEIU Health Care Employees Pension Fund
Multiemployer Plans that Provide Pension Benefits
Contributions by employer	9,830,000	9,156,000	7,315,000
Value of surcharge imposed	0	0	0
Minimum funding requirements (as a percent)	11.50%
Southern California United Food and Commercial Workers Unions and Drug Employers Pension Fund
Multiemployer Plans that Provide Pension Benefits
Contributions by employer	3,416,000	459,000	6,585,000
Value of surcharge imposed	0	0	0
Minimum funding requirements for pharmacists	1.156
Minimum funding requirements for non pharmacists	0.524
Northern California Pharmacists, Clerks and Drug Employers Pension Plan
Multiemployer Plans that Provide Pension Benefits
Contributions by employer	2,858,000	2,937,000	2,951,000
Value of surcharge imposed	0	0	0
Minimum funding requirements	0.57
United Food and Commercial Workers Union-Employer Pension Fund
Multiemployer Plans that Provide Pension Benefits
Contributions by employer	559,000	529,000	517,000
Value of surcharge imposed	0	0	0
Minimum funding requirements	1.38
Other Funds
Multiemployer Plans that Provide Pension Benefits
Contributions by employer	3,124,000	1,513,000	1,685,000
1360 New Jersey Pension
Multiemployer Plans that Provide Pension Benefits
Withdrawal liability incurred	2,032,000
Central Ohio Locals 1059 and 75
Multiemployer Plans that Provide Pension Benefits
Withdrawal liability incurred	3,000,000
NW OH Pension Fund
Multiemployer Plans that Provide Pension Benefits
Withdrawal liability incurred	$ 1,300,000
Red Zone | Maximum
Multiemployer Plans that Provide Pension Benefits
Percentage of plan funded	65.00%
Yellow Zone | Maximum
Multiemployer Plans that Provide Pension Benefits
Percentage of plan funded	80.00%
Green Zone | Minimum
Multiemployer Plans that Provide Pension Benefits
Percentage of plan funded	80.00%