Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Sep. 10, 2016	Sep. 12, 2015
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year	$ 30
Settlement of Asset Retirement Obligations Through Noncash Payments, Amount	55
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year	35
Settlement of Asset Retirement Obligations Through Noncash Payments, Amount	65
Multiemployer Plans, Postretirement Benefit [Member]
Multiemployer Plans [Line Items]
Multiemployer Plan, Period Contributions	$ 21	$ 20