Industry Segment Information (Schedule of Revenue by Geographical Areas) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Aug. 31, 2020	May 31, 2020	Feb. 29, 2020	Nov. 30, 2019	Aug. 31, 2019	May 31, 2019	Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	$ 128,405	$ 123,106	$ 113,788	$ 109,393	$ 101,885	$ 121,054	$ 109,182	$ 111,951	$ 474,692	$ 444,072	$ 547,705
Revenues [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues									$ 474,692	$ 444,072	$ 547,705
Percentage									100.00%	100.00%	100.00%
Revenues [Member] | United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues									$ 259,557	$ 257,719	$ 321,698
Percentage									55.00%	58.00%	59.00%
Revenues [Member] | International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues									$ 215,135	$ 186,353	$ 226,007
Percentage									45.00%	42.00%	41.00%
Long-Lived Tangible Assets [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage									100.00%	100.00%	100.00%
Long-lived tangible assets	79,581				68,968				$ 79,581	$ 68,968	$ 57,248
Long-Lived Tangible Assets [Member] | United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage									81.00%	76.00%	69.00%
Long-lived tangible assets	64,857				52,187				$ 64,857	$ 52,187	$ 39,290
Long-Lived Tangible Assets [Member] | International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage									19.00%	24.00%	31.00%
Long-lived tangible assets	$ 14,724				$ 16,781				$ 14,724	$ 16,781	$ 17,958