Income Taxes - Net Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Jan. 31, 2016	Jan. 25, 2015
Deferred tax assets
Current	$ 0	$ 2,478
Non-current	7,354	106
Subtotal	7,354	2,584
Deferred tax liabilities
Current	0	(1,444)
Non-current	(6,802)	(2,477)
Subtotal	(6,802)	(3,921)
Net deferred tax assets	$ 552
Net deferred tax assets (liabilities)		$ (1,337)