Significant portions of deferred tax assets and deferred tax liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2012	Dec. 30, 2011
Deferred tax assets:
Accrued liabilities and allowances	$ 14,503	$ 13,288
Deferred compensation	17,252	13,916
Total deferred tax assets	31,755	27,204
Deferred tax liabilities:
State taxes	(1,099)	(1,095)
Deductible goodwill	(2,829)	(2,724)
Property, equipment and leasehold improvements	(500)	(866)
Other	(1,311)	(534)
Total deferred tax liabilities	(5,739)	(5,219)
Net deferred tax assets	$ 26,016	$ 21,985