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Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
Aug. 31, 2012
Aug. 31, 2011
Deferred tax assets:    
Accrued payroll and related expenses $ 886 $ 803
State income taxes paid 302 644
Accounts receivable 702 550
Reserves and accruals 2,676 2,508
Stock-based compensation expense 2,121 2,391
Net operating loss 214 159
Uniform capitalization 1,156 565
Other 1,167 1,401
Total gross deferred tax assets 9,224 9,021
Valuation allowance (141) (78)
Total deferred tax assets 9,083 8,943
Deferred tax liabilities:    
Property and equipment, net (1,163) (1,005)
Amortization of tax goodwill and intangible assets (24,708) (23,169)
Other (197) (210)
Total deferred tax liabilities (27,539) (25,907)
Net deferred tax liabilities (18,456) (16,964)
Low Income Housing Partnerships [Member]
    
Deferred tax liabilities:    
Investment in low income housing partnerships (982) (1,032)
VML Partnership [Member]
    
Deferred tax liabilities:    
Investment in VML partnership $ (489) $ (491)