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Fair Value Measurements-10Q (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2015
Nov. 01, 2014
Oct. 31, 2015
Nov. 01, 2014
Jan. 31, 2015
Fair value measurements          
Level 1 to Level 2 Transfers $ 0 $ 0 $ 0 $ 0  
Level 2 to Level 1 Transfers 0 0 0 0  
Assets measured on a nonrecurring basis          
Carrying value of long-lived assets held and used 219 200 219 200  
Fair value of long-lived assets held and used 37 40 37 40  
Realized losses from asset impairment (100) $ 0 $ (182) $ (144)  
Weighted average cost of capital     15.00% 15.00%  
Minimum          
Assets measured on a nonrecurring basis          
Annual sales growth     0.00% (3.00%)  
Maximum          
Assets measured on a nonrecurring basis          
Annual sales growth     3.00% 3.50%  
Level 1          
Assets measured on a nonrecurring basis          
Carrying value of long-lived assets held and used         $ 270
Realized losses from asset impairment         (216)
Nonrecurring basis | Level 3          
Assets measured on a nonrecurring basis          
Fair value of long-lived assets held and used 37   $ 37   54
Recurring basis          
Fair value measurements          
Total assets 5,009   5,009   18,045
Recurring basis | Level 2          
Fair value measurements          
Total assets 5,009   5,009   18,045
Short Term Investments | Recurring basis          
Fair value measurements          
Short-term investments         13,293
Short Term Investments | Recurring basis | Level 2          
Fair value measurements          
Short-term investments         13,293
Long Term Investments | Recurring basis          
Fair value measurements          
Long-term investments         4,752
Long Term Investments | Recurring basis | Level 2          
Fair value measurements          
Long-term investments         4,752
Certificates of deposit | Short Term Investments | Recurring basis          
Fair value measurements          
Short-term investments 480   480   4,078
Certificates of deposit | Short Term Investments | Recurring basis | Level 2          
Fair value measurements          
Short-term investments 480   480   4,078
Commercial paper | Short Term Investments | Recurring basis          
Fair value measurements          
Short-term investments 1,500   1,500   7,384
Commercial paper | Short Term Investments | Recurring basis | Level 2          
Fair value measurements          
Short-term investments 1,500   1,500   7,384
Corporate bonds | Short Term Investments | Recurring basis          
Fair value measurements          
Short-term investments 2,821   2,821   1,616
Corporate bonds | Short Term Investments | Recurring basis | Level 2          
Fair value measurements          
Short-term investments 2,821   2,821   1,616
Corporate bonds | Long Term Investments | Recurring basis          
Fair value measurements          
Long-term investments         2,853
Corporate bonds | Long Term Investments | Recurring basis | Level 2          
Fair value measurements          
Long-term investments         2,853
U.S. Agency securities | Long Term Investments | Recurring basis          
Fair value measurements          
Long-term investments         1,899
U.S. Agency securities | Long Term Investments | Recurring basis | Level 2          
Fair value measurements          
Long-term investments         1,899
Municipal bonds | Short Term Investments | Recurring basis          
Fair value measurements          
Short-term investments 208   208   215
Municipal bonds | Short Term Investments | Recurring basis | Level 2          
Fair value measurements          
Short-term investments $ 208   $ 208   $ 215