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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. 29, 2018	Oct. 06, 2018	Jul. 14, 2018	Dec. 30, 2017	Oct. 07, 2017	Jul. 15, 2017	Apr. 21, 2018	Apr. 22, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Numerator:
Earnings (loss) from continuing operations	$ (14,027)	$ 17,545	$ 17,838	$ 34,710	$ (123,452)	$ 21,060	$ 12,435	$ 15,065	$ 33,791	$ (52,617)	$ 57,056
Adjustment for (earnings) loss attributable to participating securities									(746)	908	(1,011)
Earnings (loss) from continuing operations used in calculating earnings per share									$ 33,045	$ (51,709)	$ 56,045
Denominator:
Weighted average shares outstanding, including participating securities									36,012	37,419	37,483
Adjustment for participating securities									(795)	(646)	(664)
Shares used in calculating basic earnings per share									35,217	36,773	36,819
Effect of dilutive stock options									10		73
Shares used in calculating diluted earnings per share									35,227	36,773	36,892
Basic earnings (loss) per share from continuing operations	$ (0.39)	$ 0.49	$ 0.50	$ 0.94	$ (3.31)	$ 0.56	$ 0.34	$ 0.40	$ 0.94	$ (1.41)	$ 1.52
Diluted earnings (loss) per share from continuing operations	$ (0.39)	$ 0.49	$ 0.50	$ 0.94	$ (3.31)	$ 0.56	$ 0.34	$ 0.40	$ 0.94	$ (1.41)	$ 1.52

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