Fair Value Measurements - Financial Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis by Balance Sheet Line (Details) - Recurring - USD ($) $ in Thousands	Jan. 31, 2016	Jan. 25, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	$ 16,866	$ 23,271
Other assets	0	33
Total financial assets	16,866	23,304
Total financial liabilities	1,457	1,619
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	16,866	23,271
Other assets	0	0
Total financial assets	16,866	23,271
Total financial liabilities	0	0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Other assets	0	33
Total financial assets	0	33
Total financial liabilities	0	0
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Other assets	0	0
Total financial assets	0	0
Total financial liabilities	1,457	1,619
Cycleo [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Earn-out liability	1,457	1,619
Cycleo [Member] | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Earn-out liability	0	0
Cycleo [Member] | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Earn-out liability	0	0
Cycleo [Member] | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Earn-out liability	$ 1,457	$ 1,619