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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Operating activities:    
Net income $ 10,944 $ 6,792
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,203 1,218
Net (gains) losses on sales and disposals of property and equipment (9) 58
Deferred income taxes 183 261
Excess tax benefits from settlements of stock-based equity awards 375 (298)
Stock-based compensation 619 745
Unrealized foreign currency exchange (gains) losses, net (210) 336
Provision for bad debts 221 38
Changes in assets and liabilities:    
Trade accounts receivable (1,111) 6,985
Inventories (890) (5,698)
Other assets (613) (940)
Accounts payable and accrued liabilities 646 3,316
Accrued payroll and related expenses 981 (2,103)
Income taxes payable 3,199 2,075
Deferred and other long-term liabilities 57 0
Net cash provided by operating activities 15,595 12,785
Investing activities:    
Purchases of property and equipment (527) (777)
Proceeds from sales of property and equipment 64 920
Purchases of short-term investments (20,928) 0
Net cash (used in) provided by investing activities (21,391) 143
Financing activities:    
Repayments of long-term debt 0 (10,715)
Proceeds from revolving credit facility 0 69,550
Repayments of revolving credit facility 0 (37,550)
Dividends paid (4,579) (4,330)
Proceeds from issuance of common stock 944 901
Treasury stock purchases (8,091) (18,601)
Excess tax benefits from settlements of stock-based equity awards (375) 298
Net cash used in financing activities (12,101) (447)
Effect of exchange rate changes on cash and cash equivalents 613 (2,230)
Net (decrease) increase in cash and cash equivalents (17,284) 10,251
Cash and cash equivalents at beginning of period 69,719 56,393
Cash and cash equivalents at end of period $ 52,435 $ 66,644