Commitments and Contingencies (Details) $ in Millions	3 Months Ended	9 Months Ended
	Oct. 25, 2015 USD ($)	Oct. 25, 2015 USD ($)
Loss Contingencies [Line Items]
Ground lease to a syndicate of banks - Synthetic Lease		99 years
Total Synthetic Lease term	7 years 6 months
Estimated construction period	2 years 6 months
Lease term - Synthetic Lease	5 years
Maximum number of renewal options	3	3
Lessee Leasing Arrangements, Operating Leases, Renewal Term	5 years
Expected construction costs for Synthetic lease financing	$ 380	$ 380
Maximum residual value guarantee percentage	87.50%	87.50%
Maximum total leverage ratio	3.0	3.0
Minimum interest coverage ratio	3.5	3.5