Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jan. 28, 2018	Jan. 29, 2017
Components of Deferred Tax Assets and Liabilities [Abstract]
Deferred revenue	$ 0	$ 6,229
Inventory reserve	2,406	3,096
Bad debt reserve	659	645
Accrued service fees	306	0
Foreign tax credits	9,987	0
Research credit carryforward	11,707	25,770
NOL carryforward	8,326	42,870
Payroll and related accruals	7,344	12,556
Share-based compensation	9,282	5,524
Foreign pension deferred	477	727
Other deferred assets	1,847	5,918
Valuation allowance	(41,050)	(82,961)
Total non-current deferred tax asset	11,291	20,374
Inventory reserve - foreign	0	0
Goodwill and other intangibles	(5,844)	(12,534)
Property, plant and equipment	(4,955)	(7,483)
Repatriation of foreign earnings	(10,427)	0
Other non-current deferred tax liabilities	(511)	(1,745)
Total non-current deferred tax liabilities	(21,737)	(21,762)
Deferred tax liabilities	$ (10,446)	$ (1,388)