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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Operating activities:    
Net income $ 21,405 $ 17,376
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 2,438 2,475
Net (gains) losses on sales and disposals of property and equipment (5) 33
Deferred income taxes 263 383
Excess tax benefits from settlements of stock-based equity awards (528) (320)
Stock-based compensation 1,369 1,678
Unrealized foreign currency exchange (gains) losses, net (822) 820
Provision for bad debts 382 44
Changes in assets and liabilities:    
Trade accounts receivable (2,203) (2,865)
Inventories (4,075) (8,408)
Other assets (2,543) 17
Accounts payable and accrued liabilities 2,770 6,676
Accrued payroll and related expenses 1,204 (3,837)
Income taxes payable 2,610 1,618
Deferred and other long-term liabilities 58 (516)
Net cash provided by operating activities 22,323 15,174
Investing activities:    
Purchases of property and equipment (1,151) (2,314)
Proceeds from sales of property and equipment 70 1,033
Purchases of short-term investments (31,279) (531)
Maturities of short-term investments 1,037 516
Net cash used in investing activities (31,323) (1,296)
Financing activities:    
Repayments of long-term debt 0 (10,715)
Proceeds from revolving credit facility 5,000 89,600
Repayments of revolving credit facility 0 (49,600)
Dividends paid (9,441) (8,986)
Proceeds from issuance of common stock 2,451 984
Treasury stock purchases (12,414) (22,685)
Excess tax benefits from settlements of stock-based equity awards 528 320
Net cash used in financing activities (13,876) (1,082)
Effect of exchange rate changes on cash and cash equivalents (1,229) (1,494)
Net (decrease) increase in cash and cash equivalents (24,105) 11,302
Cash and cash equivalents at beginning of period 69,719 56,393
Cash and cash equivalents at end of period $ 45,614 $ 67,695