Operations in Different Geographic Areas (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 03, 2014	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Dec. 28, 2012	Sep. 28, 2012	Jun. 29, 2012	Mar. 30, 2012	Jan. 03, 2014		Dec. 28, 2012		Dec. 30, 2011
Operations In Different Geographic Areas [Line Items]
Property, Equipment and Leasehold Improvements, net	$ 28,721				$ 27,446				$ 28,721		$ 27,446
Revenues	72,772	75,231	75,505	72,660	72,946	73,298	74,484	71,925	296,168	[1]	292,653	[1]	272,446	[1]
UNITED STATES
Operations In Different Geographic Areas [Line Items]
Property, Equipment and Leasehold Improvements, net	28,076				26,857				28,076		26,857
Revenues									263,341	[1]	260,760	[1]	239,994	[1]
Foreign Countries
Operations In Different Geographic Areas [Line Items]
Property, Equipment and Leasehold Improvements, net	645				589				645		589
Revenues									$ 32,827	[1]	$ 31,893	[1]	$ 32,452	[1]

[1] Geographic revenues are allocated based on the location of the client.