Exponent (EXPO) 10-Q 8 Aug 14 2014 Q2 Quarterly report Financial data

Document_And_Entity_Informatio

Document And Entity Information	6 Months Ended
	Jul. 04, 2014	Aug. 01, 2014
Document Information [Line Items]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	4-Jul-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'
Entity Registrant Name	'EXPONENT INC	'
Entity Central Index Key	'0000851520	'
Current Fiscal Year End Date	'--01-02	'
Entity Filer Category	'Accelerated Filer	'
Trading Symbol	'EXPO	'
Entity Common Stock, Shares Outstanding	'	13,087,900

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Jul. 04, 2014	Jan. 03, 2014
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$112,895	$122,948
Short-term investments	31,647	33,171
Accounts receivable, net of allowance for doubtful accounts of $2,927 and $2,771 at July 4, 2014 and January 3, 2014, respectively	85,795	76,980
Prepaid expenses and other assets	14,551	10,450
Deferred income taxes	10,330	8,135
Total current assets	255,218	251,684
Property, equipment and leasehold improvements, net	28,831	28,721
Goodwill	8,607	8,607
Deferred income taxes	22,498	21,102
Deferred compensation plan assets	34,856	33,501
Other assets	1,110	551
Total assets	351,120	344,166
Current liabilities:	'	'
Accounts payable and accrued liabilities	9,985	8,442
Accrued payroll and employee benefits	47,590	56,934
Deferred revenues	6,936	6,771
Total current liabilities	64,511	72,147
Other liabilities	1,884	1,181
Deferred compensation	36,606	33,447
Deferred rent	2,200	2,332
Total liabilities	105,201	109,107
Stockholders’ equity:	'	'
Common stock, $0.001 par value; 100,000 shares authorized; 16,427 shares issued at July 4, 2014 and January 3, 2014	16	16
Additional paid-in capital	157,594	141,250
Accumulated other comprehensive income	'	'
Investment securities, available for sale	32	10
Foreign currency translation adjustments	468	99
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total	500	109
Retained earnings	233,436	226,040
Treasury stock, at cost; 3,339 and 3,363 shares held at July 4, 2014 and January 3, 2014, respectively	-145,627	-132,356
Total stockholders’ equity	245,919	235,059
Total liabilities and stockholders’ equity	$351,120	$344,166

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Jul. 04, 2014	Jan. 03, 2014
In Thousands, except Per Share data, unless otherwise specified
Accounts receivable, allowance for contract losses and doubtful accounts	$2,927	$2,771
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	100,000	100,000
Common stock, shares issued	16,427	16,427
Treasury stock, shares	3,339	3,363

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Income (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jul. 04, 2014	Jun. 28, 2013	Jul. 04, 2014	Jun. 28, 2013
Revenues:	'	'	'	'
Revenues before reimbursements	$72,331	$71,919	$145,298	$140,911
Reimbursements	4,243	3,586	7,238	7,254
Revenues	76,574	75,505	152,536	148,165
Operating expenses:	'	'	'	'
Compensation and related expenses	46,049	44,432	94,907	92,994
Other operating expenses	6,450	6,207	12,767	12,354
Reimbursable expenses	4,243	3,586	7,238	7,254
General and administrative expenses	3,748	3,687	7,446	7,119
Total operating expenses	60,490	57,912	122,358	119,721
Operating income	16,084	17,593	30,178	28,444
Other income, net:	'	'	'	'
Interest income, net	40	36	84	81
Miscellaneous income, net	2,274	642	3,501	3,251
Total other income, net	2,314	678	3,585	3,332
Income before income taxes	18,398	18,271	33,763	31,776
Income taxes	7,134	7,423	13,345	12,952
Net income	$11,264	$10,848	$20,418	$18,824
Net income per share:	'	'	'	'
Basic	$0.83	$0.80	$1.51	$1.38
Diluted	$0.81	$0.77	$1.47	$1.34
Shares used in per share computations:	'	'	'	'
Basic	13,520	13,637	13,528	13,658
Diluted	13,873	14,007	13,919	14,068
Cash dividends declared per common share	$0.25	$0.15	$0.50	$0.30

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jul. 04, 2014	Jun. 28, 2013	Jul. 04, 2014	Jun. 28, 2013
Net income	$11,264	$10,848	$20,418	$18,824
Other comprehensive income (loss):	'	'	'	'
Foreign currency translation adjustments, net of tax	317	24	369	-437
Unrealized gain (loss) on available for sale investment securities, net of tax	8	-10	22	-22
Comprehensive income	$11,589	$10,862	$20,809	$18,365

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jul. 04, 2014	Jun. 28, 2013
Cash flows from operating activities:	'	'
Net income	$20,418	$18,824
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization of property, equipment and leasehold improvements	2,633	2,384
Amortization of premiums and accretion of discounts on short-term investments	443	137
Deferred rent	-132	942
Provision for doubtful accounts	828	473
Stock-based compensation	7,875	8,331
Deferred income tax provision	-3,896	-1,692
Excess tax benefit from equity awards	-5,090	-3,807
Changes in operating assets and liabilities:	'	'
Accounts receivable	-9,643	-1,558
Prepaid expenses and other assets	-3,348	-3,495
Accounts payable and accrued liabilities	6,504	-43
Accrued payroll and employee benefits	-6,027	-5,175
Deferred revenues	165	1,079
Net cash provided by operating activities	10,730	16,400
Cash flows from investing activities:	'	'
Capital expenditures	-1,976	-3,701
Purchase of short-term investments	-1,067	0
Maturity of short-term investments	2,186	14,290
Net cash (used in) provided by investing activities	-857	10,589
Cash flows from financing activities:	'	'
Excess tax benefit from equity awards	5,090	3,807
Payroll taxes for restricted stock units	-6,267	-6,112
Repurchase of common stock	-14,383	-17,626
Exercise of share-based payment awards	1,540	883
Dividends and dividend equivalents paid	-6,580	-3,967
Net cash used in financing activities	-20,600	-23,015
Effect of foreign currency exchange rates on cash and cash equivalents	674	-598
Net (decrease) increase in cash and cash equivalents	-10,053	3,376
Cash and cash equivalents at beginning of period	122,948	113,268
Cash and cash equivalents at end of period	$112,895	$116,644

Basis_of_Presentation

Basis of Presentation	6 Months Ended
	Jul. 04, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Basis of Presentation	'
	Note 1: Basis of Presentation
	Exponent, Inc. (referred to as the “Company” or “Exponent”) is an engineering and scientific consulting firm that provides solutions to complex problems. The Company operates on a 52-53 week fiscal year ending on the Friday closest to the last day of December.
	The accompanying unaudited condensed consolidated financial statements are prepared in accordance with accounting principles generally accepted in the United States of America for interim financial information, the instructions to Form 10-Q and Article 10 of Regulation S-X of the Securities and Exchange Commission. Accordingly, they do not contain all the information and notes required by accounting principles generally accepted in the United States of America for complete financial statements. In the opinion of management, all adjustments which are necessary for the fair presentation of the condensed consolidated financial statements have been included and all such adjustments are of a normal and recurring nature. The operating results for the three and six months ended July 4, 2014 are not necessarily representative of the results of future quarterly or annual periods. The following information should be read in conjunction with the audited consolidated financial statements and accompanying notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended January 3, 2014 which was filed with the U.S. Securities and Exchange Commission on February 28, 2014.
	The unaudited condensed consolidated financial statements include the accounts of Exponent, Inc. and its subsidiaries, which are all wholly owned. All intercompany accounts and transactions have been eliminated in consolidation.
	Authorized Capital Stock. In a letter dated May 23, 2006, the Company committed to stockholders to limit its use of authorized capital stock to 40 million common shares, and 2 million preferred shares, unless the approval of the Company’s stockholders is subsequently obtained, such as through a further amendment to the Company’s authorized capital stock.
	Dividend. The Company declared and paid cash dividends per common share during the periods presented as follows:
		Fiscal Year 2014
		Dividends		Amount
		Per Share		(in thousands)
	First Quarter	$	0.25	$	3,262
	Second Quarter	$	0.25		3,270
				$	6,532
		Fiscal Year 2013
		Dividends		Amount
		Per Share		(in thousands)
	First Quarter	$	0.15	$	1,969
	Second Quarter	$	0.15		1,998
	Third Quarter	$	0.15		1,945
	Fourth Quarter	$	0.15		1,965
				$	7,877
	Prior to 2013 the Company had never paid cash dividends on its common stock. On July 22, 2014 the Company’s Board of Directors announced a cash dividend of $0.25 per share of the Company’s common stock, payable September 26, 2014, to stockholders of record as of September 5, 2014. The Company expects to continue paying quarterly dividends in the future, subject to declaration by the Company’s Board of Directors.
	Use of Estimates. The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the period. Significant items subject to such estimates and assumptions include accounting for revenue recognition and estimating the allowance for doubtful accounts. Actual results could differ from those estimates.

Fair_Value_Measurements

Fair Value Measurements	6 Months Ended
	Jul. 04, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	Note 2: Fair Value Measurements
	The Company measures certain financial assets and liabilities at fair value on a recurring basis, including available-for-sale fixed income securities, trading fixed income and equity securities held in its deferred compensation plan and the liability associated with its deferred compensation plan. There have been no transfers between fair value measurement levels during the six months ended July 4, 2014 and June 28, 2013. Any transfers between fair value measurement levels would be recorded on the actual date of the event or change in circumstances that caused the transfer. The fair value of these certain financial assets and liabilities was determined using the following inputs at July 4, 2014:
			Fair Value Measurements at Reporting Date Using
	(In thousands)		Total		Quoted Prices in		Significant Other		Significant
					Active Markets for		Observable Inputs		Unobservable
					Identical Assets		(Level 2)		Inputs
					(Level 1)				(Level 3)
	Assets
	Money market securities (1)		$	38,721	$	38,721	$	-	$	-
	Fixed income available for sale securities (2)			31,647		-		31,647		-
	Fixed income trading securities held in deferred compensation plan (3)			9,642		9,642		-		-
	Equity trading securities held in deferred compensation plan (3)			32,806		32,806		-		-
	Total		$	112,816	$	81,169	$	31,647	$	-
	Liabilities
	Deferred compensation plan (4)			44,169		44,169		-		-
	Total		$	44,169	$	44,169	$	-	$	-
		-1	Included in cash and cash equivalents on the Company’s unaudited condensed consolidated balance sheet.
		-2	Included in short-term investments on the Company’s unaudited condensed consolidated balance sheet.
		-3	Included in prepaid expenses and other assets and deferred compensation plan assets on the Company’s unaudited condensed consolidated balance sheet.
		-4	Included in accrued payroll and employee benefits and deferred compensation on the Company’s unaudited condensed consolidated balance sheet.
	The fair value of these certain financial assets and liabilities was determined using the following inputs at January 3, 2014:
			Fair Value Measurements at Reporting Date Using
	(In thousands)		Total		Quoted Prices in		Significant Other		Significant
					Active Markets for		Observable Inputs		Unobservable
					Identical Assets		(Level 2)		Inputs
					(Level 1)				(Level 3)
	Assets
	Money market securities (1)		$	37,099	$	37,099	$	-	$	-
	Fixed income available for sale securities (2)			33,171		-		33,171		-
	Fixed income trading securities held in deferred compensation plan (3)			9,535		9,535		-		-
	Equity trading securities held in deferred compensation plan (3)			28,444		28,444		-		-
	Total		$	108,249	$	75,078	$	33,171	$	-
	Liabilities
	Deferred compensation plan (4)			37,926		37,926		-		-
	Total		$	37,926	$	37,926	$	-	$	-
		-1	Included in cash and cash equivalents on the Company’s consolidated balance sheet.
		-2	Included in short-term investments on the Company’s consolidated balance sheet.
		-3	Included in prepaid expenses and other assets and deferred compensation plan assets on the Company’s consolidated balance sheet.
		-4	Included in accrued payroll and employee benefits and deferred compensation on the Company’s consolidated balance sheet.
	Fixed income available-for-sale securities as of July 4, 2014 and January 3, 2014 represent primarily obligations of state and local government agencies. Fixed income and equity trading securities represent mutual funds held in the Company’s deferred compensation plan. See Note 6 for additional information about the Company’s deferred compensation plan.
	Cash, cash equivalents and short-term investments consisted of the following as of July 4, 2014:
			Amortized		Unrealized		Unrealized		Estimated
	(In thousands)		Cost		Gains		Losses		Fair Value
	Classified as current assets:
	Cash		$	74,174	$	-	$	-	$	74,174
	Cash equivalents:
	Money market securities			38,721		-		-		38,721
	Total cash equivalents			38,721		-		-		38,721
	Total cash and cash equivalents			112,895		-		-		112,895
	Short-term investments:
	State and municipal bonds			31,594		53		-		31,647
	Total short-term investments			31,594		53		-		31,647
	Total cash, cash equivalents and short-term investments		$	144,489	$	53	$	-	$	144,542
	Cash, cash equivalents and short-term investments consisted of the following as of January 3, 2014:
			Amortized		Unrealized		Unrealized		Estimated
	(In thousands)		Cost		Gains		Losses		Fair Value
	Classified as current assets:
	Cash		$	85,849	$	-	$	-	$	85,849
	Cash equivalents:
	Money market securities			37,099		-		-		37,099
	Total cash equivalents			37,099		-		-		37,099
	Total cash and cash equivalents			122,948		-		-		122,948
	Short-term investments:
State and municipal bonds			33,155		25		-9		33,171
Total short-term investments			33,155		25		-9		33,171
Total cash, cash equivalents and short-term investments		$	156,103	$	25	$	-9	$	156,119
The following table summarizes the cost and estimated fair value of short-term fixed income securities classified as short-term investments based on stated effective maturities as of July 4, 2014:
		Amortized		Estimated
(In thousands)		Cost		Fair Value
Due within one year		$	21,321	$	21,347
Due between one and two years			10,273		10,300
Total		$	31,594	$	31,647
At July 4, 2014 and January 3, 2014, the Company did not have any assets or liabilities valued using significant unobservable inputs.
The following financial instruments are not measured at fair value on the Company's consolidated balance sheet at July 4, 2014 and January 3, 2014, but require disclosure of their fair values: accounts receivable, other assets and accounts payable. The estimated fair value of such instruments at July 4, 2014 and January 3, 2014 approximates their carrying value as reported on the consolidated balance sheet due to their generally short maturities. If measured at fair value in the financial statements, these instruments would be categorized as Level 2 of the fair value hierarchy.
There were no other-than-temporary impairments or credit losses related to available-for-sale securities during the three and six months ended July 4, 2014 and June 28, 2013.

Net_Income_Per_Share

Net Income Per Share	6 Months Ended
	Jul. 04, 2014
Earnings Per Share [Abstract]	'
Net Income Per Share	'
	Note 3: Net Income Per Share
	Basic per share amounts are computed using the weighted-average number of common shares outstanding during the period. Diluted per share amounts are calculated using the weighted-average number of common shares outstanding during the period and, when dilutive, the weighted-average number of potential common shares from the issuance of common stock to satisfy outstanding restricted stock units and the exercise of outstanding options to purchase common stock using the treasury stock method.
	The following schedule reconciles the shares used to calculate basic and diluted net income per share:
		Three Months Ended				Six Months Ended
	(In thousands)	July 4,		June 28,		July 4,		June 28,
		2014		2013		2014		2013
	Shares used in basic per share computation		13,520		13,637		13,528		13,658
	Effect of dilutive common stock options outstanding		65		70		73		75
	Effect of dilutive restricted stock units outstanding		288		300		318		335
	Shares used in diluted per share computation		13,873		14,007		13,919		14,068
	There were no options excluded from the diluted per share calculations for the three and six months ended July 4, 2014. There were no options excluded from the diluted per share calculations for the three and six months ended June 28, 2013.

StockBased_Compensation

Stock-Based Compensation	6 Months Ended
	Jul. 04, 2014
Share-Based Compensation [Abstract]	'
Stock-Based Compensation	'
	Note 4: Stock-Based Compensation
	Restricted Stock Units
	Restricted stock unit grants are designed to attract and retain employees, and to better align employee interests with those of the Company’s stockholders. For a select group of employees, up to 40% of their annual bonus is settled with fully vested restricted stock unit awards. Under these fully vested restricted stock unit awards, the holder of each award has the right to receive one share of the Company’s common stock for each fully vested restricted stock unit four years from the date of grant. Each individual who receives a fully vested restricted stock unit award is also granted a matching number of unvested restricted stock unit awards. Unvested restricted stock unit awards are also granted for select new hires and promotions. These unvested restricted stock unit awards generally cliff vest four years from the date of grant, at which time the holder of each award will have the right to receive one share of the Company’s common stock for each restricted stock unit award provided the holder of each award has met certain employment conditions. In the case of retirement at 59½ years or older, all unvested restricted stock unit awards will continue to vest, provided that the holder of each award does all consulting work through the Company and does not become an employee for a past or present client, beneficial party or competitor of the Company.
	The value of these restricted stock unit awards is determined based on the market price of the Company’s common stock on the date of grant. The value of fully vested restricted stock unit awards issued is recorded as a reduction to accrued bonuses. The portion of bonus expense that the Company expects to settle with fully vested restricted stock unit awards is recorded as stock-based compensation during the period the bonus is earned. The Company recorded stock-based compensation expense associated with accrued bonus awards of $1,582,000 and $1,625,000 during the three months ended July 4, 2014 and June 28, 2013, respectively. For the six months ended July 4, 2014 and June 28, 2013, the Company recorded stock-based compensation expense associated with accrued bonus awards of $3,168,000 and $3,138,000, respectively. The value of the unvested restricted stock unit awards granted is recognized on a straight-line basis over the shorter of the four-year vesting period or the period between the grant date and the date the award recipient turns 59½. If the award recipient is 59½ years or older on the date of grant, the value of the entire award is expensed upon grant. The Company recorded stock-based compensation expense associated with the unvested restricted stock unit awards of $936,000 and $1,166,000 during the three months ended July 4, 2014 and June 28, 2013, respectively. The Company recorded stock-based compensation expense associated with the unvested restricted stock unit awards of $4,163,000 and $4,324,000 during the six months ended July 4, 2014 and June 28, 2013, respectively.
	Stock Options
	Stock options are granted for terms of ten years and generally vest 25% per year over a four-year period from the grant date. For options granted on or after January 1, 2012, all unvested stock option awards will continue to vest in the case of retirement at 59½ or older, provided that the holder of each award does all consulting work through the Company and does not become an employee for a past or present client, beneficial party or competitor of the Company. The Company grants options at exercise prices equal to the fair value of the Company’s common stock on the date of grant. The Company recorded stock-based compensation expense of $64,000 and $249,000 during the three months ended July 4, 2014 and June 28, 2013, respectively, associated with stock option grants. The Company recorded stock-based compensation expense of $544,000 and $869,000 during the six months ended July 4, 2014 and June 28, 2013, respectively, associated with stock option grants.
	The Company uses the Black-Scholes option-pricing model to determine the fair value of options granted. The determination of the fair value of stock-based awards on the date of grant using an option-pricing model is affected by the Company’s stock price as well as assumptions regarding a number of complex and subjective variables. These variables include expected stock price volatility over the term of the award, actual and projected employee stock option exercise behaviors, the risk-free interest rate and expected dividends.
	The Company used historical exercise and post-vesting forfeiture and expiration data to estimate the expected term of options granted. The historical volatility of the Company’s common stock over a period of time equal to the expected term of the options granted was used to estimate expected volatility. The risk-free interest rate used in the option-pricing model was based on United States Treasury zero-coupon issues with remaining terms similar to the expected term on the options. The Company is required to estimate forfeitures at the time of grant and revise those estimates in subsequent periods if actual forfeitures differ from those estimates. Historical data was used to estimate pre-vesting option forfeitures and stock-based compensation expense was recorded only for those awards that are expected to vest. All share-based payment awards are recognized on a straight-line basis over the requisite service periods of the awards.

Treasury_Stock

Treasury Stock	6 Months Ended
	Jul. 04, 2014
Equity [Abstract]	'
Treasury Stock	'
	Note 5: Treasury Stock
	On February 9, 2012, the Company’s Board of Directors authorized $35,000,000 for the repurchase of the Company’s common stock. On February 15, 2013, the Company’s Board of Directors authorized an additional $35,000,000 for the repurchase of the Company’s common stock. On May 29, 2014, the Company’s Board of Directors authorized an additional $35,000,000 for the repurchase of the Company’s common stock.
	The Company repurchased 197,988 shares of its common stock for $14,383,000 during the six months ended July 4, 2014.  The Company repurchased 327,727 shares of its common stock for $17,118,000 during the six months ended June 28, 2013.  As of July 4, 2014, the Company had remaining authorization under its stock repurchase plans of $51,617,000 to repurchase shares of common stock.
	Net losses related to the re-issuance of treasury stock to settle restricted stock unit and stock option awards of $0 and $88,000 were recorded as a reduction to retained earnings during the three months ended July 4, 2014 and June 28, 2013, respectively. Net losses related to the re-issuance of treasury stock to settle restricted stock unit and stock option awards of $6,050,000 and $10,113,000 were recorded as a reduction to retained earnings during the six months ended July 4, 2014 and June 28, 2013, respectively.

Deferred_Compensation_Plan

Deferred Compensation Plan	6 Months Ended
	Jul. 04, 2014
Deferred Compensation Arrangements [Abstract]	'
Deferred Compensation Plan	'
	Note 6: Deferred Compensation Plan
	The Company maintains a nonqualified deferred compensation plan for the benefit of a select group of highly compensated employees. Under this plan, participants may elect to defer up to 100% of their compensation. Company assets that are earmarked to pay benefits under the plan are held in a rabbi trust and are subject to the claims of the Company’s creditors. As of July 4, 2014 and January 3, 2014, the invested amounts under the plan totaled $42,448,000 and $37,979,000, respectively. These assets are classified as trading securities and are recorded at fair value with changes recorded as adjustments to other income and expense.
	As of July 4, 2014 and January 3, 2014, vested amounts due under the plan totaled $44,169,000 and $37,926,000, respectively. Changes in the liability are recorded as adjustments to compensation expense. During the three months ended July 4, 2014 and June 28, 2013, the Company recognized compensation expense of $1,952,000 and $168,000, respectively, as a result of changes in the market value of the trust assets with the same amount being recorded as income in other income, net. During the six months ended July 4, 2014 and June 28, 2013, the Company recognized compensation expense of $2,682,000 and $2,234,000, respectively, as a result of changes in the market value of the trust assets with the same amount being recorded as income in other income, net.

Supplemental_Cash_Flow_Informa

Accounts Receivable, Net	6 Months Ended
	Jul. 04, 2014
Receivables [Abstract]	'
Accounts Receivable, Net	'
	Note 8: Accounts Receivable, Net
	At July 4, 2014 and January 3, 2014, accounts receivable, net, was comprised of the following:
		July 4,		January 3,
	(In thousands)	2014		2014
	Billed accounts receivable	$	57,500	$	52,674
	Unbilled accounts receivable		31,222		27,077
	Allowance for doubtful accounts		-2,927		-2,771
	Total accounts receivable, net	$	85,795	$	76,980

Accounts_Receivable_Net

Accounts Receivable, Net	6 Months Ended
	Jul. 04, 2014
Receivables [Abstract]	'
Accounts Receivable, Net	'
	Note 8: Accounts Receivable, Net
	At July 4, 2014 and January 3, 2014, accounts receivable, net, was comprised of the following:
		July 4,		January 3,
	(In thousands)	2014		2014
	Billed accounts receivable	$	57,500	$	52,674
	Unbilled accounts receivable		31,222		27,077
	Allowance for doubtful accounts		-2,927		-2,771
	Total accounts receivable, net	$	85,795	$	76,980

Segment_Reporting

Segment Reporting	6 Months Ended
	Jul. 04, 2014
Disclosure Segment Information [Abstract]	'
Segment Reporting	'
	Note 9: Segment Reporting
	The Company has two operating segments based on two primary areas of service. The Engineering and Other Scientific operating segment is a broad service group providing technical consulting in different practices primarily in the areas of engineering and technology development. The Environmental and Health operating segment provides services in the area of environmental, epidemiology and health risk analysis. This operating segment provides a wide range of consulting services relating to environmental hazards and risks and the impact on both human health and the environment.
	Segment information for the three and six months ended July 4, 2014 and June 28, 2013 follows:
	Revenues
		Three Months Ended				Six Months Ended
	(In thousands)	July 4, 2014		June 28, 2013		July 4, 2014		June 28, 2013
	Engineering and Other Scientific	$	55,293	$	53,635	$	111,120	$	106,958
	Environmental and Health		21,281		21,870		41,416		41,207
	Total revenues	$	76,574	$	75,505	$	152,536	$	148,165
	Operating Income
		Three Months Ended				Six Months Ended
	(In thousands)	July 4, 2014		June 28, 2013		July 4, 2014		June 28, 2013
	Engineering and Other Scientific	$	17,700	$	16,758	$	36,518	$	33,632
	Environmental and Health		7,191		7,900		13,164		13,480
	Total segment operating income		24,891		24,658		49,682		47,112
	Corporate operating expense		-8,807		-7,065		-19,504		-18,668
	Total operating income	$	16,084	$	17,593	$	30,178	$	28,444
	Capital Expenditures
		Three Months Ended				Six Months Ended
	(In thousands)	July 4, 2014		June 28, 2013		July 4, 2014		June 28, 2013
	Engineering and Other Scientific	$	794	$	1,573	$	1,324	$	2,934
	Environmental and Health		60		31		115		69
	Total segment capital expenditures		854		1,604		1,439		3,003
	Corporate capital expenditures		207		138		537		698
	Total capital expenditures	$	1,061	$	1,742	$	1,976	$	3,701
	Depreciation and Amortization
		Three Months Ended				Six Months Ended
	(In thousands)	July 4, 2014		June 28, 2013		July 4, 2014		June 28, 2013
	Engineering and Other Scientific	$	868	$	757	$	1,741	$	1,456
	Environmental and Health		49		71		96		145
	Total segment depreciation and amortization		917		828		1,837		1,601
	Corporate depreciation and amortization		394		407		796		783
	Total depreciation and amortization	$	1,311	$	1,235	$	2,633	$	2,384
	No single customer comprised more than 10% of the Company’s revenues during the three or six months ended July 4, 2014 and June 28, 2013. No single customer comprised more than 10% of the Company’s accounts receivable at July 4, 2014 and January 3, 2014.

Goodwill

Goodwill	6 Months Ended
	Jul. 04, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill	'
	Note 10: Goodwill
	Below is a breakdown of goodwill reported by segment as of July 4, 2014:
		Environmental		Engineering and
	(In thousands)	and Health		Other Scientific		Total
	Goodwill	$	8,099	$	508	$	8,607
	There were no acquisitions, dispositions, impairments or other changes in the carrying amount of goodwill, nor any changes in the composition of the Company’s reporting units, during the three and six months ended July 4, 2014.

Contingencies

Contingencies	6 Months Ended
	Jul. 04, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Contingencies	'
	Note 11: Contingencies
	The Company is a party to various legal actions from time to time and may be contingently liable in connection with claims and contracts arising in the normal course of business, the outcome of which the Company believes, after consultation with legal counsel, will not have a material adverse effect on its financial condition, results of operations or liquidity. However, due to the risks and uncertainties inherent in legal proceedings, actual results could differ from current expected results. All legal costs associated with litigation are expensed as incurred.

Basis_of_Presentation_Tables

Basis of Presentation (Tables)	6 Months Ended
	Jul. 04, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Common Stock Dividends Declared Per Share	'
	The Company declared and paid cash dividends per common share during the periods presented as follows:
		Fiscal Year 2014
		Dividends		Amount
		Per Share		(in thousands)
	First Quarter	$	0.25	$	3,262
	Second Quarter	$	0.25		3,270
				$	6,532
		Fiscal Year 2013
		Dividends		Amount
		Per Share		(in thousands)
	First Quarter	$	0.15	$	1,969
	Second Quarter	$	0.15		1,998
	Third Quarter	$	0.15		1,945
	Fourth Quarter	$	0.15		1,965
				$	7,877

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jul. 04, 2014
Fair Value Disclosures [Abstract]	'
Assets and Liabilities Measured at Fair Value on Recurring Basis	'
	The fair value of these certain financial assets and liabilities was determined using the following inputs at July 4, 2014:
			Fair Value Measurements at Reporting Date Using
	(In thousands)		Total		Quoted Prices in		Significant Other		Significant
					Active Markets for		Observable Inputs		Unobservable
					Identical Assets		(Level 2)		Inputs
					(Level 1)				(Level 3)
	Assets
	Money market securities (1)		$	38,721	$	38,721	$	-	$	-
	Fixed income available for sale securities (2)			31,647		-		31,647		-
	Fixed income trading securities held in deferred compensation plan (3)			9,642		9,642		-		-
	Equity trading securities held in deferred compensation plan (3)			32,806		32,806		-		-
	Total		$	112,816	$	81,169	$	31,647	$	-
	Liabilities
	Deferred compensation plan (4)			44,169		44,169		-		-
	Total		$	44,169	$	44,169	$	-	$	-
		-1	Included in cash and cash equivalents on the Company’s unaudited condensed consolidated balance sheet.
		-2	Included in short-term investments on the Company’s unaudited condensed consolidated balance sheet.
		-3	Included in prepaid expenses and other assets and deferred compensation plan assets on the Company’s unaudited condensed consolidated balance sheet.
		-4	Included in accrued payroll and employee benefits and deferred compensation on the Company’s unaudited condensed consolidated balance sheet.
	The fair value of these certain financial assets and liabilities was determined using the following inputs at January 3, 2014:
			Fair Value Measurements at Reporting Date Using
	(In thousands)		Total		Quoted Prices in		Significant Other		Significant
					Active Markets for		Observable Inputs		Unobservable
					Identical Assets		(Level 2)		Inputs
					(Level 1)				(Level 3)
	Assets
	Money market securities (1)		$	37,099	$	37,099	$	-	$	-
	Fixed income available for sale securities (2)			33,171		-		33,171		-
	Fixed income trading securities held in deferred compensation plan (3)			9,535		9,535		-		-
	Equity trading securities held in deferred compensation plan (3)			28,444		28,444		-		-
	Total		$	108,249	$	75,078	$	33,171	$	-
	Liabilities
	Deferred compensation plan (4)			37,926		37,926		-		-
	Total		$	37,926	$	37,926	$	-	$	-
		-1	Included in cash and cash equivalents on the Company’s consolidated balance sheet.
		-2	Included in short-term investments on the Company’s consolidated balance sheet.
		-3	Included in prepaid expenses and other assets and deferred compensation plan assets on the Company’s consolidated balance sheet.
		-4	Included in accrued payroll and employee benefits and deferred compensation on the Company’s consolidated balance sheet.
Cash, cash equivalents and short-term investments	'
	Cash, cash equivalents and short-term investments consisted of the following as of July 4, 2014:
			Amortized		Unrealized		Unrealized		Estimated
	(In thousands)		Cost		Gains		Losses		Fair Value
	Classified as current assets:
	Cash		$	74,174	$	-	$	-	$	74,174
	Cash equivalents:
	Money market securities			38,721		-		-		38,721
	Total cash equivalents			38,721		-		-		38,721
	Total cash and cash equivalents			112,895		-		-		112,895
	Short-term investments:
	State and municipal bonds			31,594		53		-		31,647
	Total short-term investments			31,594		53		-		31,647
	Total cash, cash equivalents and short-term investments		$	144,489	$	53	$	-	$	144,542
	Cash, cash equivalents and short-term investments consisted of the following as of January 3, 2014:
			Amortized		Unrealized		Unrealized		Estimated
	(In thousands)		Cost		Gains		Losses		Fair Value
	Classified as current assets:
	Cash		$	85,849	$	-	$	-	$	85,849
	Cash equivalents:
	Money market securities			37,099		-		-		37,099
	Total cash equivalents			37,099		-		-		37,099
	Total cash and cash equivalents			122,948		-		-		122,948
	Short-term investments:
	State and municipal bonds			33,155		25		-9		33,171
	Total short-term investments			33,155		25		-9		33,171
	Total cash, cash equivalents and short-term investments		$	156,103	$	25	$	-9	$	156,119
Summary of Cost and Estimated Fair Value of Short Term Fixed Income Securities	'
	The following table summarizes the cost and estimated fair value of short-term fixed income securities classified as short-term investments based on stated effective maturities as of July 4, 2014:
			Amortized		Estimated
	(In thousands)		Cost		Fair Value
	Due within one year		$	21,321	$	21,347
	Due between one and two years			10,273		10,300
	Total		$	31,594	$	31,647

Net_Income_Per_Share_Tables

Net Income Per Share (Tables)	6 Months Ended
	Jul. 04, 2014
Earnings Per Share [Abstract]	'
Reconciles Shares to Calculate Basic and Diluted Net Income Per Share	'
	The following schedule reconciles the shares used to calculate basic and diluted net income per share:
		Three Months Ended				Six Months Ended
	(In thousands)	July 4,		June 28,		July 4,		June 28,
		2014		2013		2014		2013
	Shares used in basic per share computation		13,520		13,637		13,528		13,658
	Effect of dilutive common stock options outstanding		65		70		73		75
	Effect of dilutive restricted stock units outstanding		288		300		318		335
	Shares used in diluted per share computation		13,873		14,007		13,919		14,068

Supplemental_Cash_Flow_Informa1

Supplemental Cash Flow Information (Tables)	6 Months Ended
	Jul. 04, 2014
Supplemental Cash Flow Information [Abstract]	'
Supplemental Disclosure of Cash Flow Information	'
	The following is supplemental disclosure of cash flow information:
		Six Months Ended
	(In thousands)	July 4, 2014		June 28, 2013
	Cash paid during period:
	Income taxes	$	9,346	$	7,902
	Non-cash investing and financing activities:
	Unrealized gain (loss) on available for sale investment securities, net of tax	$	22	$	-22
	Vested stock unit awards issued to settle accrued bonuses	$	6,008	$	5,807
	Accrual for capital expenditures	$	767	$	-

Accounts_Receivable_Net_Tables

Accounts Receivable, Net (Tables)	6 Months Ended
	Jul. 04, 2014
Receivables [Abstract]	'
Accounts Receivable, Net	'
	At July 4, 2014 and January 3, 2014, accounts receivable, net, was comprised of the following:
		July 4,		January 3,
	(In thousands)	2014		2014
	Billed accounts receivable	$	57,500	$	52,674
	Unbilled accounts receivable		31,222		27,077
	Allowance for doubtful accounts		-2,927		-2,771
	Total accounts receivable, net	$	85,795	$	76,980

Segment_Reporting_Tables

Segment Reporting (Tables)	6 Months Ended
	Jul. 04, 2014
Disclosure Segment Information [Abstract]	'
Segment Reporting Information, by Segment	'
	Segment information for the three and six months ended July 4, 2014 and June 28, 2013 follows:
	Revenues
		Three Months Ended				Six Months Ended
	(In thousands)	July 4, 2014		June 28, 2013		July 4, 2014		June 28, 2013
	Engineering and Other Scientific	$	55,293	$	53,635	$	111,120	$	106,958
	Environmental and Health		21,281		21,870		41,416		41,207
	Total revenues	$	76,574	$	75,505	$	152,536	$	148,165
	Operating Income
		Three Months Ended				Six Months Ended
	(In thousands)	July 4, 2014		June 28, 2013		July 4, 2014		June 28, 2013
	Engineering and Other Scientific	$	17,700	$	16,758	$	36,518	$	33,632
	Environmental and Health		7,191		7,900		13,164		13,480
	Total segment operating income		24,891		24,658		49,682		47,112
	Corporate operating expense		-8,807		-7,065		-19,504		-18,668
	Total operating income	$	16,084	$	17,593	$	30,178	$	28,444
	Capital Expenditures
		Three Months Ended				Six Months Ended
	(In thousands)	July 4, 2014		June 28, 2013		July 4, 2014		June 28, 2013
	Engineering and Other Scientific	$	794	$	1,573	$	1,324	$	2,934
	Environmental and Health		60		31		115		69
	Total segment capital expenditures		854		1,604		1,439		3,003
	Corporate capital expenditures		207		138		537		698
	Total capital expenditures	$	1,061	$	1,742	$	1,976	$	3,701
	Depreciation and Amortization
		Three Months Ended				Six Months Ended
	(In thousands)	July 4, 2014		June 28, 2013		July 4, 2014		June 28, 2013
	Engineering and Other Scientific	$	868	$	757	$	1,741	$	1,456
	Environmental and Health		49		71		96		145
	Total segment depreciation and amortization		917		828		1,837		1,601
	Corporate depreciation and amortization		394		407		796		783
	Total depreciation and amortization	$	1,311	$	1,235	$	2,633	$	2,384

Goodwill_Tables

Goodwill (Tables)	6 Months Ended
	Jul. 04, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Breakdown of Goodwill Reported by Segment	'
	Below is a breakdown of goodwill reported by segment as of July 4, 2014:
		Environmental		Engineering and
	(In thousands)	and Health		Other Scientific		Total
	Goodwill	$	8,099	$	508	$	8,607

Common_Stock_Dividends_Declare

Common Stock Dividends Declared And Paid Per Share (Detail) (USD $)	3 Months Ended						6 Months Ended	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jul. 04, 2014	Apr. 04, 2014	Jan. 03, 2014	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Jul. 04, 2014	Jan. 03, 2014
Common Stock Dividends [Line Items]	'	'	'	'	'	'	'	'
Dividends Per Share	$0.25	$0.25	$0.15	$0.15	$0.15	$0.15	'	'
Dividends, Total	$3,270	$3,262	$1,965	$1,945	$1,998	$1,969	$6,532	$7,877

Basis_of_Presentation_Addition

Basis of Presentation - Additional Information (Detail) (USD $)	23-May-06	Jul. 22, 2014
In Millions, except Per Share data, unless otherwise specified		Subsequent Event
Limits On Use Of Authorized Capital Stock [Line Items]	'	'
Limits on use of authorized common stock shares	40	'
Limits on use of authorized preferred stock shares	2	'
Common stock, dividends per share declared, subsequent event	'	$0.25

Assets_and_Liabilities_Measure

Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Jul. 04, 2014		Jan. 03, 2014
In Thousands, unless otherwise specified
Assets	'		'
Money market securities	$38,721	[1]	$37,099	[2]
Total	112,816		108,249
Liabilities	'		'
Deferred compensation plan	44,169	[3]	37,926	[4]
Total	44,169		37,926
Fixed income securities	'		'
Assets	'		'
Fixed income available for sale securities	31,647	[5]	33,171	[6]
Fixed income trading securities held in deferred compensation plan	9,642	[7]	9,535	[8]
Equity securities	'		'
Assets	'		'
Equity trading securities held in deferred compensation plan	32,806	[7]	28,444	[8]
Fair Value, Inputs, Level 1	'		'
Assets	'		'
Money market securities	38,721	[1]	37,099	[2]
Total	81,169		75,078
Liabilities	'		'
Deferred compensation plan	44,169	[3]	37,926	[4]
Total	44,169		37,926
Fair Value, Inputs, Level 1 | Fixed income securities	'		'
Assets	'		'
Fixed income available for sale securities	0	[5]	0	[6]
Fixed income trading securities held in deferred compensation plan	9,642	[7]	9,535	[8]
Fair Value, Inputs, Level 1 | Equity securities	'		'
Assets	'		'
Equity trading securities held in deferred compensation plan	32,806	[7]	28,444	[8]
Fair Value, Inputs, Level 2	'		'
Assets	'		'
Money market securities	0	[1]	0	[2]
Total	31,647		33,171
Liabilities	'		'
Deferred compensation plan	0	[3]	0	[4]
Total	0		0
Fair Value, Inputs, Level 2 | Fixed income securities	'		'
Assets	'		'
Fixed income available for sale securities	31,647	[5]	33,171	[6]
Fixed income trading securities held in deferred compensation plan	0	[7]	0	[8]
Fair Value, Inputs, Level 2 | Equity securities	'		'
Assets	'		'
Equity trading securities held in deferred compensation plan	0	[7]	0	[8]
Fair Value, Inputs, Level 3	'		'
Assets	'		'
Money market securities	0	[1]	0	[2]
Total	0		0
Liabilities	'		'
Deferred compensation plan	0	[3]	0	[4]
Total	0		0
Fair Value, Inputs, Level 3 | Fixed income securities	'		'
Assets	'		'
Fixed income available for sale securities	0	[5]	0	[6]
Fixed income trading securities held in deferred compensation plan	0	[7]	0	[8]
Fair Value, Inputs, Level 3 | Equity securities	'		'
Assets	'		'
Equity trading securities held in deferred compensation plan	$0	[7]	$0	[8]
[1]	Included in cash and cash equivalents on the Company’s unaudited condensed consolidated balance sheet.
[2]	Included in cash and cash equivalents on the Company’s consolidated balance sheet.
[3]	Included in accrued payroll and employee benefits and deferred compensation on the Company’s unaudited condensed consolidated balance sheet.
[4]	Included in accrued payroll and employee benefits and deferred compensation on the Company’s consolidated balance sheet.
[5]	Included in short-term investments on the Company’s unaudited condensed consolidated balance sheet.
[6]	Included in short-term investments on the Company’s consolidated balance sheet.
[7]	Included in prepaid expenses and other assets and deferred compensation plan assets on the Company’s unaudited condensed consolidated balance sheet.
[8]	Included in prepaid expenses and other assets and deferred compensation plan assets on the Company’s consolidated balance sheet.

Cash_Cash_Equivalents_And_Shor

Cash, Cash Equivalents And Short Term Investments (Detail) (USD $)	Jul. 04, 2014	Jan. 03, 2014
In Thousands, unless otherwise specified
Fair Value Measurements [Line Items]	'	'
Amortized Cost	$144,489	$156,103
Unrealized Gains	53	25
Unrealized Losses	0	-9
Estimated Fair Value	144,542	156,119
Cash	'	'
Fair Value Measurements [Line Items]	'	'
Amortized Cost	74,174	85,849
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	74,174	85,849
Money market securities	'	'
Fair Value Measurements [Line Items]	'	'
Amortized Cost	38,721	37,099
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	38,721	37,099
Total cash equivalents	'	'
Fair Value Measurements [Line Items]	'	'
Amortized Cost	38,721	37,099
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	38,721	37,099
Total cash and cash equivalents	'	'
Fair Value Measurements [Line Items]	'	'
Amortized Cost	112,895	122,948
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	112,895	122,948
State and municipal bonds	'	'
Fair Value Measurements [Line Items]	'	'
Amortized Cost	31,594	33,155
Unrealized Gains	53	25
Unrealized Losses	0	-9
Estimated Fair Value	31,647	33,171
Total short-term investments	'	'
Fair Value Measurements [Line Items]	'	'
Amortized Cost	31,594	33,155
Unrealized Gains	53	25
Unrealized Losses	0	-9
Estimated Fair Value	$31,647	$33,171

Summarizes_Cost_And_Estimated_

Summarizes Cost And Estimated Fair Value Of Short Term Fixed Income Securities (Detail) (USD $)	Jul. 04, 2014	Jan. 03, 2014
In Thousands, unless otherwise specified
Fair Value Measurements [Line Items]	'	'
Due within one year, Amortized Cost	$21,321	'
Due between one and two years, Amortized Cost	10,273	'
Total Amortized Cost	31,594	'
Due within one year, Estimated Fair Value	21,347	'
Due between one and two years, Estimated Fair Value	10,300	'
Total Estimated Fair Value	$31,647	$33,171

Reconciliation_of_Shares_Used_

Reconciliation of Shares Used to Calculate Basic and Diluted Net Income Per Share (Detail)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jul. 04, 2014	Jun. 28, 2013	Jul. 04, 2014	Jun. 28, 2013
Schedule Of Earnings Per Share Basic and Diluted [Line Items]	'	'	'	'
Shares used in basic per share computation	13,520	13,637	13,528	13,658
Shares used in diluted per share computation	13,873	14,007	13,919	14,068
Employee Stock Option	'	'	'	'
Schedule Of Earnings Per Share Basic and Diluted [Line Items]	'	'	'	'
Effect of dilutive stock outstanding	65	70	73	75
Restricted Stock Units (RSUs)	'	'	'	'
Schedule Of Earnings Per Share Basic and Diluted [Line Items]	'	'	'	'
Effect of dilutive stock outstanding	288	300	318	335

Net_Income_Per_Share_Additiona

Net Income Per Share - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jul. 04, 2014	Jun. 28, 2013	Jul. 04, 2014	Jun. 28, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Options excluded from the diluted per share	0	0	0	0

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jul. 04, 2014	Jun. 28, 2013	Jul. 04, 2014	Jun. 28, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Share Based Compensation Arrangement By Share Based Payment Award Options Expiration Term	'	'	'10 years	'
Maximum	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Percentage of annual bonus settled with fully vested restricted stock unit awards	'	'	40.00%	'
Unvested Restricted Stock	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock based compensation, vesting period	'	'	'4 years	'
Unvested Restricted Stock | Minimum	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Recipient age to expense award on grant date	'	'	'59 years 6 months	'
Employee Stock Option	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock based compensation expense	$64,000	$249,000	$544,000	$869,000
Vesting percentage of stock options granted per year	'	'	25.00%	'
Stock based compensation, vesting period	'	'	'4 years	'
Vested Restricted Stock Awards	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock based compensation expense	1,582,000	1,625,000	3,168,000	3,138,000
Stock based compensation, holding period	'	'	'4 years	'
Unvested Restricted Stock Awards	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock based compensation expense	$936,000	$1,166,000	$4,163,000	$4,324,000
Unvested Stock Options | Minimum	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Recipient age to expense award on grant date	'	'	'59 years 6 months	'

Treasury_Stock_Additional_Info

Treasury Stock - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jul. 04, 2014	Jun. 28, 2013	Jul. 04, 2014	Jun. 28, 2013	29-May-14	Feb. 15, 2013	Feb. 09, 2012
Equity, Class of Treasury Stock [Line Items]	'	'	'	'	'	'	'
Stock Repurchase Program, Authorized Amount	'	'	'	'	$35,000,000	$35,000,000	$35,000,000
Repurchase of treasury shares (in shares)	'	'	197,988	327,727	'	'	'
Repurchase of treasury shares	'	'	14,383,000	17,118,000	'	'	'
Remaining authorized amount for repurchase of common stock	51,617,000	'	51,617,000	'	'	'	'
Treasury stock reissued at lower than repurchase price	$0	$88,000	$6,050,000	$10,113,000	'	'	'

Deferred_Compensation_Plan_Add

Deferred Compensation Plan - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jul. 04, 2014	Jun. 28, 2013	Jul. 04, 2014	Jun. 28, 2013	Jan. 03, 2014
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits	'	'	'	'	'
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]	'	'	'	'	'
Trading securities	$42,448,000	'	$42,448,000	'	$37,979,000
Deferred compensation plan vested amounts due	44,169,000	'	44,169,000	'	37,926,000
Change in market value of trust assets	$1,952,000	$168,000	$2,682,000	$2,234,000	'
Maximum	'	'	'	'	'
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]	'	'	'	'	'
Percentage of compensation deferred	'	'	100.00%	'	'

Supplemental_Disclosure_of_Cas

Supplemental Disclosure of Cash Flow Information (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jul. 04, 2014	Jun. 28, 2013	Jul. 04, 2014	Jun. 28, 2013
Cash paid during period:	'	'	'	'
Income taxes	'	'	$9,346	$7,902
Non-cash investing and financing activities:	'	'	'	'
Unrealized gain (loss) on available for sale investment securities, net of tax	8	-10	22	-22
Vested stock unit awards issued to settle accrued bonuses	'	'	6,008	5,807
Accrual for capital expenditures	'	'	$767	$0

Accounts_Receivable_Net_Detail

Accounts Receivable, Net (Detail) (USD $)	Jul. 04, 2014	Jan. 03, 2014
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Allowance for doubtful accounts	($2,927)	($2,771)
Total accounts receivable, net	85,795	76,980
Billed accounts receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Accounts receivable	57,500	52,674
Unbilled accounts receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Accounts receivable	$31,222	$27,077

Segment_Information_Detail

Segment Information (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jul. 04, 2014	Jun. 28, 2013	Jul. 04, 2014	Jun. 28, 2013
Segment Reporting Information [Line Items]	'	'	'	'
Revenues	$76,574	$75,505	$152,536	$148,165
Operating income	16,084	17,593	30,178	28,444
Capital expenditures	1,061	1,742	1,976	3,701
Depreciation and amortization	1,311	1,235	2,633	2,384
Engineering and Other Scientific	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Revenues	55,293	53,635	111,120	106,958
Operating income	17,700	16,758	36,518	33,632
Capital expenditures	794	1,573	1,324	2,934
Depreciation and amortization	868	757	1,741	1,456
Environmental and Health	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Revenues	21,281	21,870	41,416	41,207
Operating income	7,191	7,900	13,164	13,480
Capital expenditures	60	31	115	69
Depreciation and amortization	49	71	96	145
Operating segments	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Operating income	24,891	24,658	49,682	47,112
Capital expenditures	854	1,604	1,439	3,003
Depreciation and amortization	917	828	1,837	1,601
Corporate	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Operating income	-8,807	-7,065	-19,504	-18,668
Capital expenditures	207	138	537	698
Depreciation and amortization	$394	$407	$796	$783

Segment_Reporting_Additional_I

Segment Reporting - Additional Information (Detail)	6 Months Ended
	Jul. 04, 2014	Jan. 03, 2014	Jun. 28, 2013
Segment Reporting Information [Line Items]	'	'	'
Number of operating segments	2	'	'
Percentage of account receivable	10.00%	10.00%	'
Percentage of Company's revenue	10.00%	'	10.00%

Breakdown_of_Goodwill_Reported

Breakdown of Goodwill Reported by Segment (Detail) (USD $)	Jul. 04, 2014	Jan. 03, 2014
In Thousands, unless otherwise specified
Goodwill [Line Items]	'	'
Goodwill	$8,607	$8,607
Environmental and Health	'	'
Goodwill [Line Items]	'	'
Goodwill	8,099	'
Engineering and Other Scientific	'	'
Goodwill [Line Items]	'	'
Goodwill	$508	'

Goodwill_Additional_Informatio

Goodwill - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended
	Jul. 04, 2014	Jul. 04, 2014
Goodwill [Line Items]	'	'
Goodwill, Acquisitions	$0	$0
Goodwill, Dispositions	0	0
Goodwill, Impairments or other changes	0	0
Goodwill, Changes in the composition	$0	$0