SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) Share data in Millions, unless otherwise specified	12 Months Ended
	Dec. 27, 2013 segment customer branch state	Dec. 28, 2012	Dec. 30, 2011
Description of business [Abstract]
Number of customers	130,000
Number of network branches operated by the Company	757
Number of states in which Company operates	50
Segment reporting [Abstract]
Number of reportable segments	1
Percentage of revenue from international operations	3.10%	3.50%	3.80%
Advertising costs [Abstract]
Advertising expense	$ 4,000,000	$ 3,700,000	$ 3,600,000
Accounts receivable and allowance for doubtful accounts [Abstract]
Allowance for doubtful accounts	$ 5,710,000	$ 4,999,000
Shares outstanding [Abstract]
Unvested restricted stock included in shares outstanding	0.7	0.6
Buildings
Plant and equipment [Abstract]
Estimated useful life	40 years
Minimum | Computers and software
Plant and equipment [Abstract]
Estimated useful life	3 years
Minimum | Furniture and equipment
Plant and equipment [Abstract]
Estimated useful life	3 years
Maximum | Computers and software
Plant and equipment [Abstract]
Estimated useful life	10 years
Maximum | Furniture and equipment
Plant and equipment [Abstract]
Estimated useful life	10 years