Business Segment and Geographic Information (Tables)

12 Months Ended

Dec. 27, 2014

Segment Reporting [Abstract]

Schedule of sales and other financial information by business segment

The following table presents revenue and other financial information by reportable segment.

	Fiscal Year Ended
	December 27, 2014		December 28, 2013		December 29, 2012
	(in thousands)
Research Models and Services
Revenue	$	507,327	$	511,350	$	521,633
Gross margin	190,092		179,493		198,291
Operating income	121,376		116,737		143,783
Total assets	375,415		460,594		411,874
Long-lived assets	138,021		161,027		172,641
Depreciation and amortization	27,512		41,837		26,725
Capital expenditures	18,749		16,717		27,077
Discovery and Safety Assessment
Revenue	$	538,218	$	432,378	$	408,908
Gross margin	150,970		106,766		97,908
Operating income	69,749		47,413		35,688
Total assets	1,088,171		766,243		760,370
Long-lived assets	408,280		394,741		414,584
Depreciation and amortization	47,138		37,720		41,001
Capital expenditures	19,759		12,561		10,051
Manufacturing Support
Revenue	$	252,117	$	221,800	$	198,989
Gross margin	131,598		108,643		95,882
Operating income	78,620		61,227		57,519
Total assets	274,952		246,467		228,804
Long-lived assets	71,367		66,352		64,254
Depreciation and amortization	14,092		17,079		13,549
Capital expenditures	15,541		9,876		10,407

Reconciliation of segment operating income to consolidated operating income

A reconciliation of segment operating income to consolidated operating income is as follows:

	Fiscal Year Ended
	December 27, 2014			December 28, 2013			December 29, 2012
	(in thousands)
Total segment operating income	$	269,745		$	225,377		$	236,990
Unallocated corporate overhead	(92,075		)	(73,976		)	(71,225		)
Consolidated operating income	$	177,670		$	151,401		$	165,765

Schedule of net sales for each significant service area

Revenue for each significant product or service offering is as follows:

	Fiscal Year Ended
	December 27, 2014		December 28, 2013		December 29, 2012
	(in thousands)
Research Models and Services	$	507,327	$	511,350	$	521,633
Discovery and Safety Assessment	538,218		432,378		408,908
Endotoxin and Microbial Detection	132,208		112,918		93,622
Other manufacturing support	119,909		108,882		105,367
Manufacturing Support	252,117		221,800		198,989
Total revenue	$	1,297,662	$	1,165,528	$	1,129,530

Summary of unallocated corporate overhead

A summary of unallocated corporate overhead consists of the following:

	Fiscal Year Ended
	December 27, 2014		December 28, 2013		December 29, 2012
	(in thousands)
Stock-based compensation expense	$	18,474	$	13,411	$	11,724
Salary, bonus and fringe	30,838		23,446		20,312
Consulting, audit and professional services	13,431		8,666		7,453
IT related expenses	6,528		11,646		12,622
Depreciation expense	7,703		6,334		6,260
Costs associated with evaluation and integration of acquisitions	6,285		1,752		3,772
Other general unallocated corporate expenses	8,816		8,721		9,082
Total unallocated corporate overhead costs	$	92,075	$	73,976	$	71,225

Schedule of sales and other financial information by geographic regions

The following table presents revenues and other financial information by geographic locations of our businesses. Included in the other non-U.S. category below are operations located in China, Korea, Australia, Singapore and India. Revenues represent sales originating in entities physically located in the identified geographic area. Long-lived assets include property, plant and equipment and other long-lived assets.

	U.S.		Europe		Canada		Japan		Other Non-U.S.		Consolidated
	(in thousands)
2014
Revenue	$	588,531	$	446,263	$	163,490	$	49,921	$	49,457	$	1,297,662
Long lived assets	386,624		153,203		95,272		23,896		17,802		676,797
2013
Revenue	$	551,340	$	353,688	$	162,404	$	59,370	$	38,726	$	1,165,528
Long lived assets	447,829		130,855		109,811		30,589		19,062		738,146
2012
Revenue	$	534,817	$	341,550	$	160,004	$	77,707	$	15,452	$	1,129,530
Long lived assets	476,927		122,351		124,302		39,642		2,457		765,679