Financial Instruments (Details) - USD ($) $ in Thousands	Feb. 27, 2016	Feb. 28, 2015
Carrying Amount
Financial instruments
Variable rate indebtedness	$ 3,027,675	$ 2,642,008
Fixed rate indebtedness	3,886,808	2,825,115
Fair Value
Financial instruments
Variable rate indebtedness	3,025,500	2,649,825
Fixed rate indebtedness	4,210,416	$ 3,230,801
Other assets
Financial instruments
Investment at amortized cost	$ 6,069