SEGMENT INFORMATION

The Company retrospectively adopted ASU 2017-07 during the three months ended March 31, 2018, which impacted segment information. Service cost is reflected in operating income within the unaudited condensed consolidated statements of income while all other components of net periodic cost are recorded in Other income, net within the unaudited condensed consolidated statements of income. See Note 1, “Basis of Presentation.” The Company’s three reportable segments are Research Models and Services (RMS), Discovery and Safety Assessment (DSA), and Manufacturing Support (Manufacturing).

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



	Three Months Ended
	March 31, 2018		April 1, 2017
	(in thousands)
RMS
Revenue	$	133,958	$	127,161
Operating income	38,527		37,690
Depreciation and amortization	4,853		5,092
Capital expenditures	4,625		2,603
DSA
Revenue	$	259,992	$	227,758
Operating income	40,859		38,335
Depreciation and amortization	20,787		19,369
Capital expenditures	12,802		8,323
Manufacturing
Revenue	$	100,020	$	90,844
Operating income	28,523		26,600
Depreciation and amortization	5,736		5,962
Capital expenditures	6,834		2,292

For the three months ended March 31, 2018 and April 1, 2017, reconciliations of segment operating income, depreciation and amortization, and capital expenditures to the respective consolidated amounts are as follows:



	Operating Income						Depreciation and Amortization				Capital Expenditures
	March 31, 2018			April 1, 2017			March 31, 2018		April 1, 2017		March 31, 2018		April 1, 2017
	(in thousands)
Total reportable segments	$	107,909		$	102,625		$	31,376	$	30,423	$	24,261	$	13,218
Unallocated corporate	(40,080		)	(32,919		)	1,834		1,988		3,465		2,702
Total consolidated	$	67,829		$	69,706		$	33,210	$	32,411	$	27,726	$	15,920

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



	Three Months Ended
	March 31, 2018		April 1, 2017
	(in thousands)
RMS	$	133,958	$	127,161
DSA	259,992		227,758
Manufacturing	100,020		90,844
Total revenue	$	493,970	$	445,763

A summary of unallocated corporate expense consists of the following:



	Three Months Ended
	March 31, 2018		April 1, 2017
	(in thousands)
Stock-based compensation	$	6,991	$	5,583
Compensation, benefits, and other employee-related expenses	20,596		14,381
External consulting and other service expenses	2,934		5,767
Information technology	2,465		2,393
Depreciation	1,834		1,987
Acquisition and integration	2,864		21
Other general unallocated corporate	2,396		2,787
Total unallocated corporate expense	$	40,080	$	32,919

Other general unallocated corporate expense consists of costs associated with departments such as senior executives, corporate accounting, legal, tax, human resources, treasury, and investor relations.

Revenue by geographic area is as follows:



	U.S.		Europe		Canada		Asia Pacific		Other		Consolidated
	(in thousands)
Three Months Ended:
March 31, 2018	$	248,980	$	160,826	$	48,578	$	34,520	$	1,066	$	493,970
April 1, 2017	231,311		136,881		47,187		30,095		289		445,763

Included in the Asia Pacific category above are operations located in China, Japan, Korea, Australia, Singapore, and India. Included in the Other category above are operations located in Brazil and Israel. Revenue represents sales originating in entities physically located in the identified geographic area.