Schedule II - Valuation and Qualifying Accounts - Allowance for Trade Receivables (Details) - USD ($) $ in Thousands		12 Months Ended
		Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016
Balance at Beginning of Year		$ 2,738	$ 1,521	$ 1,580
Charged to Expense/Against Revenue	[1]	4,737	3,381	1,917
Write-offs, Net of Recoveries		3,985	2,164	1,976
Balance at End of Year		$ 3,490	$ 2,738	$ 1,521

[1] Additions to the receivable reserve for doubtful accounts are charged to bad debt expense. Additions to the receivable reserve for billing adjustments are charged against revenues.