Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Millions	4 Months Ended		12 Months Ended
	Apr. 22, 2017	Apr. 23, 2016	Dec. 31, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Net impact of income tax expense for exercised and vested awards	$ 1.6
Operating leases, expense			$ 97.4
Accounting Standards Update201703
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Service cost	0.3	$ 0.4
Components excluding service cost	$ 1.9	$ 2.3