Consolidated Statements of Operations - USD ($)	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Income Statement [Abstract]
Net sales	$ 1,000,410,000	$ 831,954,000	$ 680,218,000
Cost of goods sold	643,373,000	540,020,000	442,427,000
Gross profit	357,037,000	291,934,000	237,791,000
Selling, general and administrative expenses	243,075,000	198,993,000	160,775,000
Operating income	113,962,000	92,941,000	77,016,000
Interest income (expense), net	(299,000)	(40,000)	125,000
Loss on debt extinguishment	0	0	244,000
Other expense (income)	0	325,000	(12,000)
Income before income taxes	114,261,000	92,656,000	76,659,000
Income tax expense	42,421,000	34,976,000	28,635,000
Net income	71,840,000	57,680,000	48,024,000
Net income attributable to participating securities	0	0	(20,000)
Net income attributable to common shareholders	$ 71,840,000	$ 57,680,000	$ 48,004,000
Basic (loss) income per common share (dollars per share)	$ 1.31	$ 1.06	$ 0.89
Diluted (loss) income per common share (dollars per share)	$ 1.30	$ 1.05	$ 0.88
Weighted average shares outstanding:
Basic shares	54,845,708	54,513,622	54,219,801
Diluted shares	55,128,870	54,793,301	54,573,855