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Fair Value Measurements - Reconciliation of Change in the Earn-out Liability (Details)
$ in Thousands
12 Months Ended
Jan. 28, 2018
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning balance $ 1,242
Current acquisitions 17,000
Changes in fair value of contingent earn-out obligations 3,892
Payments (466)
Ending balance 21,668
AptoVision  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning balance 0
Current acquisitions 17,000
Changes in fair value of contingent earn-out obligations 4,000
Payments 0
Ending balance 21,000
Cycleo [Member]  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning balance 1,242
Current acquisitions 0
Changes in fair value of contingent earn-out obligations (108)
Payments (466)
Ending balance $ 668