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Note 10 - Debt (Details Textual) - USD ($)
$ in Millions
6 Months Ended
Mar. 31, 2019
Sep. 30, 2018
Amended and Restated Credit Agreement [Member]    
Debt Instrument, Term 5 years  
Line of Credit Facility, Maximum Borrowing Capacity $ 500.0 $ 400.0
Line of Credit Facility, Maximum Borrowing Capacity, Increase (Decrease) 100.0  
Line Of Credit, Accordion Feature 250.0  
Swing Line Loan [Member]    
Line of Credit Facility, Maximum Borrowing Capacity 10.0  
Letter of Credit [Member]    
Line of Credit Facility, Maximum Borrowing Capacity 35.0  
Standby Letters of Credit [Member]    
Long-term Line of Credit, Total 7.4  
Line of Credit Facility, Remaining Borrowing Capacity $ 175.9