Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Total accumulated other comprehensive loss	$ (3,486)	$ (2,228)	$ (2,195)
Other comprehensive loss before reclassifications	(1,132)	(1,092)	108
Amounts reclassified from accumulated other comprehensive loss	0	(166)	(141)
Net current-period other comprehensive loss	(1,132)	(1,258)	(33)
Total accumulated other comprehensive loss	(4,618)	(3,486)	(2,228)
Unrealized Gain (Loss) on Auction Rate Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Total accumulated other comprehensive loss	0	166	307
Other comprehensive loss before reclassifications	0	0	0
Amounts reclassified from accumulated other comprehensive loss	0	(166)	(141)
Net current-period other comprehensive loss	0	(166)	(141)
Total accumulated other comprehensive loss	0	0	166
Unrealized Gain (Loss) on Other Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Total accumulated other comprehensive loss	(124)	16	(142)
Other comprehensive loss before reclassifications	(320)	(140)	158
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Net current-period other comprehensive loss	(320)	(140)	158
Total accumulated other comprehensive loss	(444)	(124)	16
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Total accumulated other comprehensive loss	(2,602)	(1,650)	(1,607)
Other comprehensive loss before reclassifications	(812)	(952)	(43)
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Net current-period other comprehensive loss	(812)	(952)	(43)
Total accumulated other comprehensive loss	(3,414)	(2,602)	(1,650)
Accumulated Tax Effect
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Total accumulated other comprehensive loss	(760)	(760)	(753)
Other comprehensive loss before reclassifications	0	0	(7)
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Net current-period other comprehensive loss	0	0	(7)
Total accumulated other comprehensive loss	$ (760)	$ (760)	$ (760)