Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	May 05, 2018	Feb. 03, 2018	Jul. 29, 2017	Jul. 29, 2017	Aug. 04, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds from sale of business	$ 1,800	$ 1,300
Net (loss) income from discontinued operations
Net income from discontinued operations			$ 143	$ 426
Carrying amounts of assets and liabilities included in discontinued operations
Current liabilities of discontinued operations		1,103			$ 155
Hi-Tec sales and distribution business | Disposed of by sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales and distribution business		3,100
Net (loss) income from discontinued operations
Product sales and royalty revenues			6,096	10,366
Cost of goods sold			4,830	7,820
Selling, general and administrative expenses			1,081	2,036
Depreciation and amortization			42	84
Pretax income from discontinued operations			143	426
Net income from discontinued operations			$ 143	$ 426
Carrying amounts of assets and liabilities included in discontinued operations
Accounts receivable and amounts due from sale of business		1,868
Current liabilities of discontinued operations		1,103			155
Net assets of discontinued operations		$ 765			$ (155)