Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	May 05, 2018	Feb. 03, 2018	Oct. 28, 2017	Oct. 28, 2017
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 (loss) from discontinued operations			$ (130)	$ 296
Carrying amounts of assets and liabilities included in discontinued operations
Current liabilities of discontinued operations		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			3,230	13,596
Cost of goods sold			2,310	10,131
Selling, general and administrative expenses			1,008	3,044
Depreciation and amortization			42	125
Pretax income (loss) from discontinued operations			(130)	296
Net income (loss) from discontinued operations			$ (130)	$ 296
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
Net assets of discontinued operations		$ 765