Multiemployer Plans that Provide Pension Benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 01, 2014	Mar. 02, 2013	Mar. 03, 2012
Multiemployer Plans that Provide Pension Benefits
Contributions by employer	$ 26,617	$ 19,787	$ 14,594
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 (as a percent)	5.00%
1199 SEIU Health Care Employees Pension Fund
Multiemployer Plans that Provide Pension Benefits
Contributions by employer	14,093	9,830	9,156
Value of surcharge imposed	0	0	0
Minimum funding requirements (as a percent)	15.80%
Southern California United Food and Commercial Workers Unions and Drug Employers Pension Fund
Multiemployer Plans that Provide Pension Benefits
Contributions by employer	6,476	3,416	459
Value of surcharge imposed	0	0	0
Minimum funding requirements for pharmacists (in dollars per hour)	1.242
Minimum funding requirements for non pharmacists (in dollars per hour)	0.563
Northern California Pharmacists, Clerks and Drug Employers Pension Plan
Multiemployer Plans that Provide Pension Benefits
Contributions by employer	2,900	2,858	2,937
Value of surcharge imposed	0	0	0
Minimum funding requirements (in dollars per hour)	0.57
United Food and Commercial Workers Union-Employer Pension Fund
Multiemployer Plans that Provide Pension Benefits
Contributions by employer	629	559	529
Value of surcharge imposed	0	0	0
Minimum funding requirements (in dollars per hour)	1.49
United Food and Commercial Workers Union Local 880 - Mercantile Employers Joint Pension Fund
Multiemployer Plans that Provide Pension Benefits
Contributions by employer	441	399	322
Value of surcharge imposed	0	0	0
Minimum funding requirements (in dollars per hour)	1.52
Other Funds
Multiemployer Plans that Provide Pension Benefits
Contributions by employer	2,078	2,725	1,191
Central Ohio Locals 1059 and 75
Multiemployer Plans that Provide Pension Benefits
Withdrawal liability incurred	1,000	3,000
1360 New Jersey Pension
Multiemployer Plans that Provide Pension Benefits
Withdrawal liability incurred		2,032
NW OH Pension Fund
Multiemployer Plans that Provide Pension Benefits
Withdrawal liability incurred			$ 1,300