Note 12 - Property, Equipment and Leasehold Improvements - Property, Equipment and Leasehold Improvements (Details) - USD ($) $ in Thousands	Aug. 31, 2017	Aug. 31, 2016
Property, equipment and leasehold improvements	$ 294,487	$ 253,274
Less accumulated depreciation and amortization	(194,033)	(168,652)
Property, equipment and leasehold improvements, net	100,454	84,622
Leasehold Improvements [Member]
Property, equipment and leasehold improvements	113,760	103,238
Computer Equipment [Member]
Property, equipment and leasehold improvements	138,195	110,661
Furniture and Fixtures [Member]
Property, equipment and leasehold improvements	$ 42,532	$ 39,375

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Subparagraph (SX 210.5-02(13))
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