Business Combination, Dispositions and Discontinued Operations Consolidated statements (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	May 05, 2018	Feb. 03, 2018	Feb. 02, 2019	Feb. 03, 2018	Jan. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds from sale of business			$ 5,576	$ 1,262
Net (loss) income from discontinued operations
Net loss from discontinued operations				(128)
Carrying amounts of assets and liabilities included in discontinued operations
Current liabilities of discontinued operations		$ 1,103		1,103
Business acquisition and integration costs			$ 307	7,537
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
Cash proceeds from sale of business	$ 1,800	1,300
Net (loss) income from discontinued operations
Product sales and royalty revenues				19,492
Cost of goods sold				15,106
Selling, general and administrative expenses				4,384
Depreciation and amortization				167
Gain on disposal of discontinued operations				(37)
Pretax loss from discontinued operations				(128)
Net loss from discontinued operations				(128)
Carrying amounts of assets and liabilities included in discontinued operations
Accounts receivable and amounts due from sale of business		1,868		1,868
Current liabilities of discontinued operations		1,103		1,103
Net assets of discontinued operations		$ 765		$ 765