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Industry Segment Information (Schedule Of Revenue By Geographical Areas)(Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Aug. 31, 2012 | Aug. 31, 2011 | Aug. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | $ 551,255 | $ 478,890 | $ 358,440
Percent of revenues | 100.00% | 100.00% | 100.00%
Long lived tangible assets | 56,180 | 58,465 | 57,646
Percent of long lived tangible assets | 100.00% | 100.00% | 100.00%
United States [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 354,649 | 307,694 | 204,465
Percent of revenues | 64.00% | 64.00% | 57.00%
Long lived tangible assets | 45,100 | 45,091 | 45,881
Percent of long lived tangible assets | 80.00% | 77.00% | 80.00%
International [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 196,606 | 171,196 | 153,975
Percent of revenues | 36.00% | 36.00% | 43.00%
Long lived tangible assets | $ 11,080 | $ 13,374 | $ 11,765
Percent of long lived tangible assets | 20.00% | 23.00% | 20.00%

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- Definition Amount of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 39 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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