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Business Combinations - Preliminary allocation of the purchase consideration (Details) - USD ($)
$ in Thousands
Feb. 03, 2018
Jan. 28, 2017
Dec. 07, 2016
Preliminary allocation of the purchase consideration      
Goodwill $ 16,352 $ 15,394  
Hi-Tech      
Preliminary allocation of the purchase consideration      
Cash and cash equivalents     $ 2,654
Accounts receivable     20,445
Inventories     1,327
Other current assets     2,453
Assets sold to third parties     11,147
Total current assets     38,026
Property and equipment     291
Intangible assets     53,940
Goodwill $ 1,400   16,652
Total identifiable assets acquired     108,909
Accounts payable     5,112
Other current liabilities     5,868
Total current liabilities     10,980
Deferred income taxes     7,480
Long-term income taxes payable     3,197
Net assets acquired     $ 87,252