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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Nov. 30, 2013
Nov. 30, 2012
Operating activities:    
Net income $ 11,482 $ 10,944
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,378 1,203
Net gains on sales and disposals of property and equipment (17) (9)
Deferred income taxes (154) 183
Excess tax benefits from settlements of stock-based equity awards (777) 375
Stock-based compensation 517 619
Unrealized foreign currency exchange gains, net (1,053) (210)
Provision for bad debts 215 221
Changes in assets and liabilities:    
Trade accounts receivable 2,302 (1,111)
Inventories (1,088) (890)
Other assets 117 (613)
Accounts payable and accrued liabilities (2,580) 646
Accrued payroll and related expenses (6,720) 981
Income taxes payable 3,052 3,199
Deferred and other long-term liabilities 35 57
Net cash provided by operating activities 6,709 15,595
Investing activities:    
Purchases of property and equipment (1,186) (527)
Proceeds from sales of property and equipment 95 64
Purchases of short-term investments (1,282) (20,928)
Net cash used in investing activities (2,373) (21,391)
Financing activities:    
Dividends paid (4,758) (4,579)
Proceeds from issuance of common stock 1,149 944
Treasury stock purchases (5,264) (8,091)
Excess tax benefits from settlements of stock-based equity awards 777 (375)
Net cash used in financing activities (8,096) (12,101)
Effect of exchange rate changes on cash and cash equivalents 1,745 613
Net decrease in cash and cash equivalents (2,015) (17,284)
Cash and cash equivalents at beginning of period 53,434 69,719
Cash and cash equivalents at end of period $ 51,419 $ 52,435