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FINANCING ARRANGEMENTS (Details) - USD ($)
$ in Millions
May 15, 2017
Jan. 31, 2018
May 14, 2017
Jan. 31, 2017
Revolving Credit Facility        
Financing Arrangements        
Borrowing available under financing arrangements $ 50.0   $ 10.0  
Letter of Credit        
Financing Arrangements        
Letters of credit outstanding amount   $ 18.9   $ 3.0
Borrowings outstanding under Bank financing arrangements   $ 0.0    
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility        
Financing Arrangements        
Variable rate 30-day LIBOR      
Interest rate margin on referred rate 2.00%