Fair Value Measurements (Tables)
3 Months Ended
May 02, 2015
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
The following table presents the Company's financial assets measured at fair value on a recurring basis as of May 2, 2015 and January 31, 2015, aggregated by the level in the fair value hierarchy within which those measurements fall.
 
May 2, 2015
 
Level 1
Level 2
Level 3
 
(in thousands)
U.S. treasury securities money market funds
$
2,796

$

$

 
 
 
January 31, 2015
 
Level 1
Level 2
Level 3
 
(in thousands)
U.S. treasury securities money market funds
$
166,602

$

$