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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 1 Months Ended |  |
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Sep. 27, 2013 | Sep. 28, 2012 | Sep. 27, 2013 | Sep. 28, 2012 | Dec. 28, 2012 | Feb. 04, 2013 MDT Personnel, LLC | Sep. 27, 2013 MDT Personnel, LLC | Feb. 04, 2013 MDT Personnel, LLC Customer relationships | Feb. 04, 2013 MDT Personnel, LLC Trade name/trademarks | Feb. 04, 2013 MDT Personnel, LLC Non-compete agreement | Sep. 27, 2013 Crowley Transportation Services, LLC | Jun. 30, 2013 Crowley Transportation Services, LLC Customer relationships | Jun. 30, 2013 Crowley Transportation Services, LLC Trade name/trademarks | Sep. 27, 2013 Trade name/trademarks | Dec. 28, 2012 Trade name/trademarks
Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets |  |  |  |  |  |  | $ 10,200,000 |  |  | $ 7,800,000 | $ 1,000,000 | $ 1,400,000 |  | $ 1,400,000 | $ 100,000 |  |
Weighted average useful life of acquired finite-lived intangible assets |  |  |  |  |  |  |  |  | 6 years 11 months 13 days | 8 years | 1 year 6 months | 5 years |  |  |  |  |
Acquired goodwill, after adjustments | 74,629,000 |  | 74,629,000 |  |  | 48,079,000 | 25,700,000 | [1] |  |  |  |  |  |  |  |  |
Goodwill acquired year to date |  |  | 26,500,000 | [2] |  |  |  |  | 25,700,000 |  |  |  | 800,000 |  |  |  |
Amortization of intangible assets | 1,200,000 | 800,000 | 3,400,000 |  | 2,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived trade name/trademarks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,700,000 | $ 5,700,000
[1] | The goodwill acquired is deductible for income tax purposes.
[2] | Goodwill acquired includes $25.7 million due to the MDT acquisition. Goodwill acquired also includes $0.8 million of goodwill related to our acquisition of Crowley.

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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