Changes in Accumulated Other Comprehensive (Loss) Income (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Deferred pension and other post-retirement benefit costs, taxes	$ (99)	$ 466	$ (261)
Amortization of Deferred benefit costs, tax	$ (43)	$ (11)	$ (35)