XML 62 R51.htm IDEA: XBRL DOCUMENT v3.10.0.1
Financing Arrangements (Details) - USD ($)
$ in Thousands
6 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Apr. 15, 2015
Line of Credit Facility [Line Items]      
Debt Instrument, Covenant Compliance The Company is in compliance with all covenants as of July 31, 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