Business Acquisitions Pro Forma Disclosure (Tables) (Early Discovery UK [Member])

12 Months Ended

Dec. 27, 2014

Early Discovery UK [Member]

Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]

Business Acquisition, Pro Forma Information [Table Text Block]

The following selected pro forma consolidated results of operations are presented as if the Argenta and BioFocus acquisition had occurred as of the beginning of the period immediately preceding the period of acquisition after giving effect to certain adjustments, including amortization of intangible assets and depreciation of fixed assets of $3.7 million and other one-time costs. These pro forma consolidated results of operations are for informational purposes only and do not necessarily reflect the results of operations had the companies operated as one entity during the periods reported. No effect has been given for synergies, if any, that may have been realized through the acquisition.

	Fiscal Year Ended
	December 27, 2014		December 28, 2013		December 29, 2012
	(in thousands, except per share amounts)
Revenue	$	1,322,771	$	1,249,649	$	1,215,263
Net income	$	128,195	98,508		85,902
Earnings per common share:
Basic	$	2.75	$	2.06	$	1.79
Diluted	$	2.70	$	2.03	$	1.77