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v3.10.0.1

Comparative Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 28, 2018 | Sep. 28, 2018 | Jun. 29, 2018 | Mar. 30, 2018 | Dec. 29, 2017 | Sep. 29, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 28, 2018 | Dec. 29, 2017 | Dec. 30, 2016
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues before reimbursements | $ 85,269 | $ 88,714 | $ 89,972 | $ 90,684 | $ 82,718 |  | $ 82,359 | $ 84,120 | $ 80,467 | $ 354,639 |  | $ 329,664 |  | $ 299,197 |
Revenues | 92,143 | 95,302 | 95,621 | 96,457 | 88,282 |  | 87,555 | 87,840 | 84,122 | 379,523 | [1] | 347,799 | [1] | 315,076 | [1]
Operating income | 26,786 | 20,594 | 22,478 | 21,598 | 17,795 |  | 19,305 | 20,317 | 14,634 | 91,456 |  | 72,051 |  | 61,911 |
Income before income taxes | 21,959 | 23,989 | 24,919 | 22,450 | 20,721 |  | 22,030 | 22,348 | 17,410 | 93,317 |  | 82,509 |  | 69,122 |
Net income (loss) | $ 16,036 | $ 17,453 | $ 18,425 | $ 20,340 | $ (3,705) | [2] | $ 14,643 | $ 13,791 | $ 16,576 | $ 72,254 |  | $ 41,305 |  | $ 47,480 |
Net income per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ 0.30 | $ 0.33 | $ 0.35 | $ 0.39 | $ (0.07) |  | $ 0.28 | $ 0.26 | $ 0.32 | $ 1.37 |  | $ 0.78 |  | $ 0.90 |
Diluted | $ 0.30 | $ 0.32 | $ 0.34 | $ 0.38 | $ (0.07) |  | $ 0.27 | $ 0.26 | $ 0.31 | $ 1.33 |  | $ 0.77 |  | $ 0.87 |
Shares used in per share computations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | 52,839 | 53,032 | 53,008 | 52,744 | 52,726 |  | 52,740 | 52,830 | 52,604 | 52,906 |  | 52,724 |  | 52,976 |
Diluted | 54,119 | 54,302 | 54,195 | 54,012 | 52,726 |  | 53,926 | 53,936 | 53,962 | 54,168 |  | 53,972 |  | 54,332 |
[1] | Geographic revenues are allocated based on the location of the client.
[2] | The decrease in net income and diluted earnings per share during the fourth quarter of 2017 was due to the impact of the tax legislation. During the fourth quarter of 2017, the Company recorded a tax expense of $16,507,000 related to the tax legislation signed into law during the fourth quarter of 2017. The Company has domestic deferred tax assets primarily associated with its deferred compensation plan and stock-based compensation program, which were previously valued at the federal corporate income tax rate of 35%. The Company’s deferred tax assets were re-measured at the lower enacted corporate tax rate of 21% which contributed $15,137,000 to the increase in income tax associated with the tax legislation. The Company also has foreign earnings that were subject to the mandatory repatriation tax. The total mandatory repatriation tax, net of the benefit of its foreign tax credits, contributed $1,370,000 to the increase in income tax expense associated with the tax legislation.

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