Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jan. 26, 2020	Jan. 27, 2019
Non-current deferred tax assets:
Inventory reserve	$ 4,147	$ 4,984
Bad debt reserve	20	17
Foreign tax credits	1,331	2,996
Research credit carryforward	6,063	6,693
NOL carryforward	7,659	8,773
Payroll and related accruals	9,383	8,133
Share-based compensation	5,607	14,047
Foreign pension deferred	2,070	832
Accrued sales reserves	746	763
Research and development charges	2,864	0
Goodwill and other intangibles	2,875	0
Leasing deferred assets	2,396	0
Other deferred assets	1,713	1,031
Valuation allowance	(16,189)	(18,912)
Total non-current deferred tax assets	30,685	29,357
Non-current deferred tax liabilities:
Goodwill and other intangibles	0	(3,227)
Property, plant and equipment	(6,034)	(6,482)
Repatriation of foreign earnings	(4,323)	(8,158)
Leasing deferred liabilities	(2,285)	0
Other non-current deferred tax liabilities	(1,549)	(592)
Total non-current deferred tax liabilities	(14,191)	(18,459)
Net deferred tax assets	$ 16,494	$ 10,898