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Financing Arrangements (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 15, 2015
Line of Credit Facility [Line Items]      
Debt Instrument, Covenant Compliance The Company is in compliance with all covenants as of April 30, 2018.    
JPMorgan Chase Bank [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Initiation Date Apr. 15, 2015    
Borrowing capacity under line of credit     $ 125,000
Maturity date of the line of credit Apr. 15, 2020    
Borrowing outstanding under line of credit $ 0 $ 0  
Remaining borrowing capacity under the line of credit $ 124,536