Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	May 05, 2018	Feb. 03, 2018	Apr. 29, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds from sale of business	$ 1,868	$ 1,300
Net (loss) income from discontinued operations
Net income from discontinued operations			$ 283
Carrying amounts of assets and liabilities included in discontinued operations
Current liabilities of discontinued operations	275	1,103
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			4,270
Cost of goods sold			2,990
Selling, general and administrative expenses			955
Depreciation and amortization			42
Pretax income from discontinued operations			283
Net income from discontinued operations			$ 283
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	275	1,103
Net assets of discontinued operations	$ (275)	$ 765