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Summary of Significant Accounting Policies and Basis of Presentation - Schedule of Computation of Basic and Diluted EPS For Continuing Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Oct. 08, 2016 | Jul. 16, 2016 | Jan. 02, 2016 | Oct. 10, 2015 | Jul. 18, 2015 | Apr. 23, 2016 | Apr. 25, 2015 | Dec. 31, 2016 | Jan. 02, 2016 | Jan. 03, 2015
Numerator: |  |  |  |  |  |  |  |  |  |  |
Earnings from continuing operations | $ 12,806 | $ 16,730 | $ 17,560 | $ 17,164 | $ 15,248 | $ 20,307 | $ 9,960 | $ 10,447 | $ 57,056 | $ 63,166 | $ 59,120
Adjustment for earnings attributable to participating securities |  |  |  |  |  |  |  |  | (1,011) | (1,098) | (1,015)
Earnings from continuing operations used in calculating earnings per share |  |  |  |  |  |  |  |  | $ 56,045 | $ 62,068 | $ 58,105
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding, including participating securities |  |  |  |  |  |  |  |  | 37,483 | 37,612 | 37,641
Adjustment for participating securities |  |  |  |  |  |  |  |  | (664) | (654) | (646)
Shares used in calculating basic earnings per share |  |  |  |  |  |  |  |  | 36,819 | 36,958 | 36,995
Effect of dilutive stock options |  |  |  |  |  |  |  |  | 73 | 106 | 69
Shares used in calculating diluted earnings per share |  |  |  |  |  |  |  |  | 36,892 | 37,064 | 37,064
Basic earnings per share from continuing operations | $ 0.34 | $ 0.45 | $ 0.47 | $ 0.46 | $ 0.41 | $ 0.54 | $ 0.27 | $ 0.28 | $ 1.52 | $ 1.68 | $ 1.57
Diluted earnings per share from continuing operations | $ 0.34 | $ 0.45 | $ 0.47 | $ 0.46 | $ 0.40 | $ 0.54 | $ 0.27 | $ 0.28 | $ 1.52 | $ 1.67 | $ 1.57

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- Definition Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4613673-111683 + Details
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