Comprehensive Income (Loss) - Components of Reclassifications of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]
Other gain (loss), net									$ 2,399	$ (1,365)	$ (1,141)
Provision for income taxes	$ (392)	$ (151)	$ 1,008	$ 616	$ 1,683	$ 205	$ 617	$ 248	1,081	2,753	1,654
Net income (loss)	$ 12,168	$ 8,510	$ 17,906	$ 12,366	$ 8,410	$ 4,843	$ 4,780	$ (4,374)	50,950	13,659	(32,119)
Amount Reclassified from Accumulated Other Comprehensive Loss [Member] | Unrealized Gain (Loss) on Auction Rate Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]
Other gain (loss), net									0	0	(166)
Provision for income taxes									0	0	0
Net income (loss)									$ 0	$ 0	$ (166)