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Note 18 - Debt (Tables)
12 Months Ended
Aug. 31, 2018
Notes Tables  
Schedule of Debt [Table Text Block]
   
At August 31,
 
(in thousands)
 
2018
   
2017
 
2017 Revolving Credit Facility (maturity date of March 17, 2020)
  $
575,000
    $
575,000