Litigation, Commitments and Contingencies - Capital Lease (Details) $ in Millions	Dec. 25, 2016 USD ($) lease
Loss Contingency Information About Litigation Matters
Contingent lease liability, number of domestic leases | lease	44
Estimated maximum amount of undiscounted payments for contingent lease liabilities	$ 4.1
Capital lease related to Industrial Revenue Bonds
Loss Contingency Information About Litigation Matters
Investments in Industrial Revenue Bonds	$ 80.2
Investments in Industrial Revenue Bonds, percent owned	100.00%