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Note 4 Line of Credit Facility (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2018
Feb. 01, 2018
Dec. 30, 2017
Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Maximum Borrowing Capacity       $ 375.0
Expiration Date   May 20, 2020    
Amended Cash Flow Revolver [Member]        
Line of Credit Facility [Line Items]        
Maximum Borrowing Capacity     $ 500.0  
Long-term Line of Credit $ 241.0 $ 241.0    
Letters of Credit Outstanding, Amount $ 9.0 9.0    
Additional Credit Line     200.0  
Delayed Draw Term Loan     $ 375.0  
Expiration Date Feb. 01, 2023      
Foreign Line of Credit        
Line of Credit Facility [Line Items]        
Maximum Borrowing Capacity $ 69.0 69.0    
Long-term Line of Credit $ 0.0 $ 0.0