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Note 9 - Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
Jan. 31, 2017
Jan. 31, 2016
Intangible assets, cost $ 271,874 $ 232,403
Intangible assets, amortization cost 126,429 98,841
Intangible assets. net 145,445 133,562
Customer Relationships [Member]    
Intangible assets, cost 125,057 107,743
Intangible assets, amortization cost 56,509 45,853
Developed Technology Rights [Member]    
Intangible assets, cost 137,587 117,586
Intangible assets, amortization cost 64,879 48,295
Trade Names [Member]    
Intangible assets, cost 6,314 4,515
Intangible assets, amortization cost 3,335 3,128
Noncompete Agreements [Member]    
Intangible assets, cost 2,916 2,559
Intangible assets, amortization cost $ 1,706 $ 1,565