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Industry Segment Information (Schedule Of Revenue By Geographical Areas) (Details) - USD ($) $ in Thousands	3 Months Ended										12 Months Ended
	Aug. 31, 2015		May. 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014		May. 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	$ 123,540	[1]	$ 160,707	$ 141,089	$ 134,845	$ 147,522	[1]	$ 169,936	$ 152,804	$ 147,671	$ 560,181	$ 617,933	$ 690,848
Total Long-Lived Assets	78,656					72,457					78,656	72,457	65,064
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues											350,290	377,652	428,929
Total Long-Lived Assets	61,332					55,378					61,332	55,378	53,894
International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues											209,891	240,281	261,919
Total Long-Lived Assets	$ 17,324					$ 17,079					$ 17,324	$ 17,079	$ 11,170
Revenues [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage											100.00%	100.00%	100.00%
Revenues [Member] | United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage											63.00%	61.00%	62.00%
Revenues [Member] | International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage											37.00%	39.00%	38.00%
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 [Member] | United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage											78.00%	76.00%	83.00%
Long-Lived Tangible Assets [Member] | International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage											22.00%	24.00%	17.00%
[1] The fourth quarter 2015 results were impacted by a bad debt reserve of $5.0 million on accounts receivable and a reserve of $2.9 million against foreign income tax assets.

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