v3.5.0.2
Acquired Intangible Assets Net (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jul. 30, 2016
Jan. 30, 2016
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amounts $ 64,098 $ 64,098
Accumulated Amortization and Write-Offs (51,980) (46,088)
Net Carrying Amount 12,118 18,010
Purchased and core technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite-Lived 35,498 35,498
Accumulated Amortization and Write-Offs (25,020) (21,910)
Net Carrying Amounts, Finite-Lived 10,478 13,588
Customer intangibles    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amounts, Finite-Lived 28,600 28,600
Accumulated Amortization and Write-Offs (26,960) (24,178)
Net Carrying Amounts, Finite-Lived $ 1,640 $ 4,422
Minimum | Purchased and core technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Useful Lives 4 years  
Minimum | Customer intangibles    
Acquired Finite-Lived Intangible Assets [Line Items]    
Useful Lives 5 years  
Maximum | Purchased and core technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Useful Lives 8 years  
Maximum | Customer intangibles    
Acquired Finite-Lived Intangible Assets [Line Items]    
Useful Lives 7 years