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Industry Segment Information (Schedule Of Revenue By Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Aug. 31, 2014	May 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013	Feb. 28, 2013	Nov. 30, 2012	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	$ 147,522	$ 169,936	$ 152,804	$ 147,671	$ 148,397	$ 219,542	$ 175,539	$ 147,370	$ 617,933	$ 690,848	$ 551,255
Total Long-Lived Assets	72,457				65,064				72,457	65,064	56,180
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues									377,652	428,929	354,649
Total Long-Lived Assets	55,378				53,894				55,378	53,894	45,100
International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues									240,281	261,919	196,606
Total Long-Lived Assets	$ 17,079				$ 11,170				$ 17,079	$ 11,170	$ 11,080
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									61.00%	62.00%	64.00%
Revenues [Member] | International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage									39.00%	38.00%	36.00%
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									76.00%	83.00%	80.00%
Long-Lived Tangible Assets [Member] | International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage									24.00%	17.00%	20.00%

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- Definition

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.

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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).

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