CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 27, 2015	Dec. 26, 2014
Current assets:
Cash and cash equivalents	$ 17,779	$ 19,666
Marketable securities	0us-gaap_AvailableForSaleSecurities	1,500us-gaap_AvailableForSaleSecurities
Accounts receivable, net of allowance for doubtful accounts of $6,629 and $7,603	290,746us-gaap_AccountsReceivableNetCurrent	359,903us-gaap_AccountsReceivableNetCurrent
Prepaid expenses, deposits and other current assets	15,803	18,778
Income tax receivable	10,438us-gaap_IncomeTaxesReceivable	10,516us-gaap_IncomeTaxesReceivable
Deferred income taxes	7,700us-gaap_DeferredTaxAssetsNetCurrent	5,444us-gaap_DeferredTaxAssetsNetCurrent
Total current assets	342,466us-gaap_AssetsCurrent	415,807us-gaap_AssetsCurrent
Property and equipment, net	58,591us-gaap_PropertyPlantAndEquipmentNet	61,392us-gaap_PropertyPlantAndEquipmentNet
Restricted cash and investments	172,039	168,426
Goodwill	241,855us-gaap_Goodwill	241,855us-gaap_Goodwill
Intangible assets, net	131,409	136,560
Other assets, net	41,111us-gaap_OtherAssetsNoncurrent	42,631us-gaap_OtherAssetsNoncurrent
Total assets	987,471us-gaap_Assets	1,066,671us-gaap_Assets
Current liabilities:
Accounts payable and other accrued expenses	53,769	50,256
Accrued wages and benefits	65,693	69,692
Current portion of workers' compensation claims reserve	61,784	64,556
Other current liabilities	2,582us-gaap_OtherLiabilitiesCurrent	2,726us-gaap_OtherLiabilitiesCurrent
Total current liabilities	183,828us-gaap_LiabilitiesCurrent	187,230us-gaap_LiabilitiesCurrent
Workers’ compensation claims reserve, less current portion	181,214	178,283
Long-term debt, less current portion	110,817us-gaap_LongTermDebtNoncurrent	199,383us-gaap_LongTermDebtNoncurrent
Deferred income taxes	21,726	19,768
Other long-term liabilities	14,444us-gaap_OtherLiabilitiesNoncurrent	12,673us-gaap_OtherLiabilitiesNoncurrent
Total liabilities	512,029us-gaap_Liabilities	597,337us-gaap_Liabilities
Commitments and contingencies
Shareholders’ equity:
Preferred stock, $0.131 par value, 20,000 shares authorized; No shares issued and outstanding	0us-gaap_PreferredStockValue	0us-gaap_PreferredStockValue
Common stock, no par value, 100,000 shares authorized; 41,939 and 41,530 shares issued and outstanding	1us-gaap_CommonStockValueOutstanding	1us-gaap_CommonStockValueOutstanding
Accumulated other comprehensive income/(loss)	(374)	871
Retained earnings	475,815	468,462
Total shareholders’ equity	475,442us-gaap_StockholdersEquity	469,334us-gaap_StockholdersEquity
Total liabilities and shareholders’ equity	$ 987,471	$ 1,066,671

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant