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Note 18 - Debt (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Mar. 17, 2017
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2016
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total   $ 15,900 $ 8,400 $ 3,000
Payments of Debt Issuance Costs   438 $ 12
London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate   1.00%    
PNC Bank, National Associations [Member] | The 2017 Revolving Credit Facility [Member]        
Payments of Debt Issuance Costs     400  
Bank of America, N.A. [Member] | The 2015 Revolving Credit Facility [Member]        
Extinguishment of Debt, Amount $ 365,000      
The 2017 Revolving Credit Facility [Member] | PNC Bank, National Associations [Member]        
Line of Credit Facility, Maximum Borrowing Capacity 575,000      
Line of Credit Facility, Maximum Amount Of Additional Borrowings 225,000      
Line of Credit Facility, Minimum Borrowing Amount Required for Additional Borrowings $ 25,000      
Long-term Line of Credit, Total     $ 575,000  
Line of Credit Facility, Commitment Fee Amount   $ 0    
The 2017 Revolving Credit Facility [Member] | PNC Bank, National Associations [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate 1.00%