For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	$ 132,897	$ 141,319	$ 120,573	$ 121,622	$ 123,540	$ 160,707	$ 141,089	$ 134,845	$ 516,411	$ 560,181	$ 617,933
Revenues [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues									$ 516,411	$ 560,181	$ 617,933
Percentage									100.00%	100.00%	100.00%
Revenues [Member] \| United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues									$ 321,554	$ 350,290	$ 377,652
Percentage									62.00%	63.00%	61.00%
Revenues [Member] \| International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues									$ 194,857	$ 209,891	$ 240,281
Percentage									38.00%	37.00%	39.00%
Long-Lived Tangible Assets [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Long-Lived Assets	77,627				78,656				$ 77,627	$ 78,656	$ 72,457
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]
Total Long-Lived Assets	58,098				61,332				$ 58,098	$ 61,332	$ 55,378
Percentage									75.00%	78.00%	76.00%
Long-Lived Tangible Assets [Member] \| International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Long-Lived Assets	$ 19,529				$ 17,324				$ 19,529	$ 17,324	$ 17,079
Percentage									25.00%	22.00%	24.00%