Summary of Significant Accounting Policies (Details 5) (USD $) In Thousands, unless otherwise specified	Mar. 03, 2012	Feb. 26, 2011	Feb. 27, 2010
Certain Business Risks and Management's Plans
Senior secured revolving credit facility	1,175,000
Senior secured revolving credit facility outstanding	136,000
Pharmacy sales | Customers | Top five third party payors
Significant Concentrations
Percentage of concentration risk	66.40%
Pharmacy sales | Customers | Largest third party payor
Significant Concentrations
Percentage of concentration risk	22.90%	23.80%	21.20%
Pharmacy sales | Customers | Medicaid agencies and related managed care Medicaid payors
Significant Concentrations
Percentage of concentration risk	17.70%
Pharmacy sales | Customers | Largest Medicaid agency
Significant Concentrations
Percentage of concentration risk	2.10%
Pharmacy sales | Customers | Medicare Part D
Significant Concentrations
Percentage of concentration risk	28.20%
Purchases | Suppliers | McKesson Corp.
Significant Concentrations
Percentage of concentration risk	90.90%
Purchases | Suppliers | Manufactures
Significant Concentrations
Percentage of concentration risk	76.00%