Comprehensive Loss - Components of Reclassifications of Accumulated Other Comprehensive Loss (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other gain (loss), net									$ (1,365)	$ (1,141)	$ (1,050)
Provision for income taxes	1,683	205	617	248	414	308	601	331	2,753	1,654	2,190
Amount Reclassified from Accumulated Other Comprehensive Loss | Unrealized Gain (Loss) on Auction Rate Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other gain (loss), net									0	(166)	(141)
Provision for income taxes									0	0	0
Total, net of income tax									$ 0	$ (166)	$ (141)