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Schedule II - Valuation and Qualifying Accounts (Tables)
12 Months Ended
Aug. 31, 2018
Notes Tables  
Valuation and Qualifying Accounts Disclosure [Table Text Block]
Receivable reserve
and billing adjustments
 
Balance at Beginning of Year
   
Charged to Expense/
Against Revenue
(1)
   
Write-offs,
Net of Recoveries
   
Balance at
End of Year
 
2018
  $
2,738
    $
4,737
    $
3,985
    $
3,490
 
2017
  $
1,521
    $
3,381
    $
2,164
    $
2,738
 
2016
  $
1,580
    $
1,917
    $
1,976
    $
1,521