INCOME TAXES (Details) (USD $)	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011		Aug. 31, 2010
Income Tax Contingency [Line Items]
Deferred tax liabilities arising from timing differences in certain subsidiaries	$ 2,300,000	$ 2,400,000
Current income tax expense (benefit)	33,918,000	26,075,000		18,594,000
Deferred income tax expense (benefit)	1,135,000	1,393,000		4,193,000
Provision for income taxes	35,053,000	27,468,000		22,787,000
Provision for income taxes, percentage	34.10%	30.70%		31.50%
U.S. valuation allowance	697,000	8,000		8,350,000
Income tax expense (benefit)	35,053,000	27,468,000	[1]	22,787,000
Deferred tax assets, net, foreign	8,700,000	7,800,000
Operating loss carryforwards (NOLs), annual limitation amount	3,500,000
Deferred tax liabilities, undistributed foreign earnings	186,700,000	144,700,000
Income taxes paid	29,100,000	22,400,000		19,300,000
Error in Reconciliation of Net Deferred Tax Assets
Income Tax Contingency [Line Items]
Income tax expense (benefit)		3,100,000
Operating Loss Carryforwards, Foreign
Income Tax Contingency [Line Items]
Valuation allowance, deferred tax asset, change in amount	0	(377,000)
Federal and State Jurisdicition
Income Tax Contingency [Line Items]
Operating loss carryforwards (NOLs)	$ 24,800,000	$ 8,100,000

[1] Includes a $3.2 million error that decreased expense in the United States operations related to prior periods. See Note 1 - Company Overview and Basis of Presentation.