Summary of Company's Balance Sheet Related Pension and Other Post-Retirement Benefit Plan (Detail) - USD ($) $ in Thousands	Apr. 23, 2016	Jan. 02, 2016
Post-Retirement Plans [Abstract]
Current benefit liability	$ 1,118	$ 1,118
Noncurrent benefit liability	72,601	76,541
Accumulated other comprehensive loss, net of tax	$ 85,557	$ 86,610