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Note 16 - Debt (Tables)
6 Months Ended
Feb. 28, 2019
Notes Tables  
Schedule of Debt [Table Text Block]
(in thousands)
 
February 28,
2019
   
August 31,
2018
 
2017 Revolving Credit Facility (maturity date of March 17, 2020)
  $
575,000
    $
575,000