Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ in Thousands	Feb. 27, 2016	Feb. 28, 2015
New accounting pronouncements
Other assets	$ 213,890	$ 200,345
Total Assets	11,277,010	8,777,425
Long-term debt, less current maturities	6,914,393	5,397,588
Total liabilities	10,695,582	8,720,369
Total liabilities and stockholders' equity	$ 11,277,010	8,777,425
As Previously Reported
New accounting pronouncements
Other assets		286,172
Total Assets		8,863,252
Long-term debt, less current maturities		5,483,415
Total liabilities		8,806,196
Total liabilities and stockholders' equity		8,863,252
Adjustments
New accounting pronouncements
Other assets		(85,827)
Total Assets		(85,827)
Long-term debt, less current maturities		(85,827)
Total liabilities		(85,827)
Total liabilities and stockholders' equity		(85,827)
Accounting Standards Update 2015-03 | Impact of Adoption of ASU
New accounting pronouncements
Noncurrent assets		(85,827)
Long-term debt, less current maturities		$ (85,827)