Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 26, 2020	Oct. 27, 2019	Jul. 28, 2019	Apr. 28, 2019	Jan. 27, 2019	Oct. 28, 2018	Jul. 29, 2018	Apr. 29, 2018	Jan. 26, 2020	Jan. 27, 2019	Jan. 28, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales	$ 138,001	$ 141,011	$ 137,146	$ 131,354	$ 160,006	$ 173,550	$ 163,211	$ 130,429	$ 547,512	$ 627,196	$ 587,847
Selected Quarterly Financial Data (in Dollars) [Abstract]
Gross profit	84,277	86,248	84,884	81,275	98,867	106,562	100,124	71,469	336,684	377,022	351,971
Operating income	10,196	17,877	11,769	12,167	27,167	44,784	35,221	(1,673)	52,009	105,499	66,621
Net income attributable to common shareholders	$ 2,934	$ 13,997	$ 2,192	$ 12,748	$ 13,843	$ 14,787	$ 27,260	$ 13,749	$ 31,871	$ 69,639	$ 34,649
Earnings Per Share, Basic and Diluted [Abstract]
Basic (in dollars per share)	$ 0.04	$ 0.21	$ 0.03	$ 0.19	$ 0.21	$ 0.22	$ 0.41	$ 0.21	$ 0.48	$ 1.06	$ 0.52
Diluted (in dollars per share)	$ 0.04	$ 0.21	$ 0.03	$ 0.19	$ 0.20	$ 0.22	$ 0.40	$ 0.20	$ 0.47	$ 1.02	$ 0.51
Weighted average number of shares used in computing earnings per share:
Basic (in shares)	66,041,000	66,387,000	66,519,000	66,105,000	65,525,000	66,014,000	66,063,000	66,324,000	66,263,000	65,982,000	66,027,000
Diluted (in shares)	67,051,000	67,318,000	67,746,000	67,976,000	68,165,000	68,731,000	68,880,000	68,195,000	67,418,000	68,481,000	67,605,000
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net sales		$ 141,011	$ 137,146	$ 131,354	$ 160,006	$ 173,550	$ 163,211	$ 130,429
Selected Quarterly Financial Data (in Dollars) [Abstract]
Gross profit		86,248	84,884	81,275	98,867	106,562	100,124	71,469
Operating income		22,165	15,548	12,817	26,771	41,867	32,936	(3,097)		$ 98,477	$ 68,736
Net income attributable to common shareholders		$ 17,599	$ 5,366	$ 13,294	$ 13,340	$ 12,165	$ 25,169	$ 12,382
Earnings Per Share, Basic and Diluted [Abstract]
Basic (in dollars per share)		$ 0.27	$ 0.08	$ 0.20	$ 0.20	$ 0.18	$ 0.38	$ 0.19		$ 0.96	$ 0.55
Diluted (in dollars per share)		$ 0.26	$ 0.08	$ 0.20	$ 0.20	$ 0.18	$ 0.37	$ 0.18		$ 0.92	$ 0.54
Weighted average number of shares used in computing earnings per share:
Basic (in shares)		66,387,000	66,519,000	66,105,000	65,525,000	66,014,000	66,063,000	66,324,000
Diluted (in shares)		67,318,000	67,746,000	67,976,000	68,165,000	68,731,000	68,880,000	68,195,000