ACQUISITION ACQUISITION (Details) (USD $)	3 Months Ended		9 Months Ended			0 Months Ended	3 Months Ended	9 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 26, 2014	Sep. 27, 2013	Sep. 26, 2014 Revolving Credit Facility [Member] Bank of America, N.A. and Wells Fargo Capital Finance, LLC [Member]	Jun. 30, 2014 Staffing Solutions Holdings, Inc. (Seaton) [Member]	Sep. 26, 2014 Staffing Solutions Holdings, Inc. (Seaton) [Member]	Sep. 26, 2014 Staffing Solutions Holdings, Inc. (Seaton) [Member]	Jun. 30, 2014 Staffing Solutions Holdings, Inc. (Seaton) [Member] Revolving Credit Facility [Member] Bank of America, N.A. and Wells Fargo Capital Finance, LLC [Member]
Business Acquisition [Line Items]
Revenue from services	$ 633,365,000	$ 451,169,000	$ 1,482,655,000	$ 1,219,977,000
Business Acquisition, Effective Date of Acquisition						Jun. 30, 2014
Payments to Acquire Businesses, Net of Cash Acquired			307,972,000	54,872,000		308,000,000
Line of Credit Facility, Maximum Borrowing Capacity					300,000,000
Cash from credit facility used in business acquisition									187,000,000
Acquisition-Related and integration Costs Associated with a Business Combination							2,300,000	4,300,000
Business Combination, Integration Related Costs Accrual							100,000	100,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual							148,600,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual							2,100,000
BUSINESS COMBINATION, DEPRECIATION AND AMORTIZATION OF ACQUIRED COMPANY INCLUDED							$ 4,600,000