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Comparative Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 01, 2021 | Oct. 02, 2020 | Jul. 03, 2020 | Apr. 03, 2020 | Jan. 03, 2020 | Sep. 27, 2019 | Jun. 28, 2019 | Mar. 29, 2019 | Jan. 01, 2021 | Jan. 03, 2020 | Dec. 28, 2018
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues before reimbursements | $ 97,330 | $ 93,499 | $ 87,863 | $ 99,720 | $ 102,220 | $ 95,506 | $ 100,263 | $ 93,401 | $ 378,412 |  | $ 391,390 |  | $ 354,639 |
Revenues | 103,239 | 98,663 | 92,045 | 105,953 | 110,114 | 101,548 | 106,506 | 99,031 | 399,900 | [1] | 417,199 | [1] | 379,523 | [1]
Operating Income | 17,734 | 20,407 | 9,120 | 35,988 | 21,350 | 23,184 | 24,823 | 15,754 | 83,249 |  | 85,111 |  | 91,456 |
Income before income taxes | 26,829 | 24,638 | 21,414 | 24,055 | 26,806 | 25,211 | 28,851 | 23,322 |  |  |  |  |  |
Net income (loss) | $ 21,840 | $ 18,084 | $ 16,346 | $ 26,282 | $ 19,121 | $ 19,633 | $ 20,994 | $ 22,712 | $ 82,552 |  | $ 82,460 |  | $ 72,254 |
Net income per share |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ 0.42 | $ 0.35 | $ 0.31 | $ 0.50 | $ 0.36 | $ 0.37 | $ 0.40 | $ 0.43 | $ 1.58 |  | $ 1.56 |  | $ 1.37 |
Diluted | $ 0.41 | $ 0.34 | $ 0.31 | $ 0.49 | $ 0.36 | $ 0.36 | $ 0.39 | $ 0.42 | $ 1.55 |  | $ 1.53 |  | $ 1.33 |
Shares used in per share computations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares used in basic per share computation | 52,402 | 52,316 | 52,259 | 52,575 | 52,681 | 52,802 | 52,745 | 52,536 | 52,388 |  | 52,691 |  | 52,906 |
Diluted | 53,260 | 53,209 | 53,139 | 53,657 | 53,817 | 54,002 | 53,872 | 53,814 | 53,323 |  | 53,884 |  | 54,168 |
[1] | Geographic revenues are allocated based on the location of the client.

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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1505-109256 + Details
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