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Net Income Per Share (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Net income available to common shareholders
Net income attributable to CRA as reported	$ 5,931	$ 5,580	$ 12,399	$ 10,245
Less: net income attributable to participating shares	22	24	49	34
Net income available to common shareholders	$ 5,909	$ 5,556	$ 12,350	$ 10,211
Reconciliation of basic to diluted weighted average shares of common stock outstanding
Basic weighted average shares outstanding	7,764,000	7,925,000	7,784,000	7,970,000
Dilutive stock options and restricted stock units	156,000	293,000	195,000	312,000
Diluted weighted average shares outstanding	7,920,000	8,218,000	7,979,000	8,282,000
Calculation of common stock equivalents for purposes of computing diluted weighted average shares outstanding
Anti-dilutive securities excluded from EPS computation (in shares)	106,018	45,200	44,069	31,378

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