Reclassification Out of Accumulated Other Comprehensive Income to Statement of Operations (Detail) - USD ($) $ in Thousands		3 Months Ended
		Apr. 03, 2016	Apr. 05, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains, net of tax		$ 83	$ 330
Prior service benefit	[1]	80	74
Total reclassifications		163	404
Interest Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gains, net of tax		$ 83	$ 330

[1] The amortization of prior service benefit is included in the computation of net periodic pension cost and postretirement benefit; see Note O: "Retirement Plans."