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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Operating activities:    
Net income $ 21,799 $ 21,405
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 2,849 2,438
Net gains on sales and disposals of property and equipment (33) (5)
Deferred income taxes (335) 263
Excess tax benefits from settlements of stock-based equity awards (820) (528)
Stock-based compensation 1,479 1,369
Unrealized foreign currency exchange losses (gains), net 132 (822)
Provision for bad debts 174 382
Changes in assets and liabilities:    
Trade accounts receivable (4,885) (2,203)
Inventories (1,387) (4,075)
Other assets (3,309) (2,543)
Accounts payable and accrued liabilities 5,470 2,770
Accrued payroll and related expenses (9,603) 1,204
Income taxes payable 2,744 2,610
Deferred and other long-term liabilities 32 58
Net cash provided by operating activities 14,307 22,323
Investing activities:    
Purchases of property and equipment (1,991) (1,151)
Proceeds from sales of property and equipment 171 70
Purchases of intangible assets (1,776)  
Purchases of short-term investments (5,643) (31,279)
Maturities of short-term investments 908 1,037
Net cash used in investing activities (8,331) (31,323)
Financing activities:    
Proceeds from revolving credit facility 10,000 5,000
Dividends paid (9,973) (9,441)
Proceeds from issuance of common stock 1,241 2,451
Treasury stock purchases (22,270) (12,414)
Excess tax benefits from settlements of stock-based equity awards 820 528
Net cash used in financing activities (20,182) (13,876)
Effect of exchange rate changes on cash and cash equivalents 1,734 (1,229)
Net decrease in cash and cash equivalents (12,472) (24,105)
Cash and cash equivalents at beginning of period 53,434 69,719
Cash and cash equivalents at end of period $ 40,962 $ 45,614