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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
	Jan. 02, 2021	Oct. 03, 2020	Jul. 11, 2020	Dec. 28, 2019	Oct. 05, 2019	Jul. 13, 2019	Apr. 18, 2020	Apr. 20, 2019	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Numerator:
Earnings from continuing operations				$ 5,473	$ (310)	$ (6,767)		$ 7,521	$ 75,914	$ 5,917	$ 33,791
Adjustment for earnings attributable to participating securities									(1,871)	(149)	(746)
Earnings from continuing operations used in calculating earnings per share									$ 74,043	$ 5,768	$ 33,045
Denominator:
Weighted average shares outstanding, including participating securities									35,861	36,271	36,012
Adjustment for participating securities									(884)	(912)	(795)
Shares used in calculating basic earnings per share									34,977	35,359	35,217
Shares used in calculating diluted earnings per share									34,978	35,359	35,227
Basic earnings per share from continuing operations	$ 0.34	$ 0.56	$ 0.80	$ 0.15	$ (0.01)	$ (0.19)	$ 0.43	$ 0.21	$ 2.12	$ 0.16	$ 0.94
Diluted earnings per share from continuing operations	$ 0.34	$ 0.56	$ 0.80	$ 0.15	$ (0.01)	$ (0.19)	$ 0.43	$ 0.21	$ 2.12	$ 0.16	$ 0.94
Stock Options [Member]
Denominator:
Effect of dilutive stock options											10
Restricted Stock Awards [Member]
Denominator:
Effect of dilutive stock options									1

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