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Note 9 - Intangible Assets (Details Textual) - USD ($)
$ in Thousands
Jan. 31, 2018
Jan. 31, 2017
Finite-Lived Intangible Assets, Net $ 178,001 $ 145,445
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 34,900  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 33,500  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 30,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 25,700  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 18,200  
Finite-Lived Intangible Assets, Amortization Expense, after Year Five $ 35,700