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Earnings Per Share - Schedule of Computation of Basic and Diluted Earnings Per Share from Continuing Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 4 Months Ended
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Apr. 21, 2018 | Apr. 22, 2017
Numerator: |  |
Earnings from continuing operations | $ 12,435 | $ 15,065
Adjustment for earnings attributable to participating securities | (246) | (276)
Earnings from continuing operations used in calculating earnings per share | $ 12,189 | $ 14,789
Denominator: |  |
Weighted average shares outstanding, including participating securities | 36,186 | 37,692
Adjustment for participating securities | (717) | (690)
Shares used in calculating basic earnings per share | 35,469 | 37,002
Effect of dilutive stock options | 11 | 64
Shares used in calculating diluted earnings per share | 35,480 | 37,066
Basic earnings per share from continuing operations | $ 0.34 | $ 0.40
Diluted earnings per share from continuing operations | $ 0.34 | $ 0.40

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- Definition Amount after tax of income (loss) from continuing operations attributable to the parent. + 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=98514028&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=63488584&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=96868048&loc=SL4613673-111683 + Details
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