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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Operating activities:      
Net income $ 35,485 $ 36,433 $ 36,095
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 4,869 4,386 4,248
Net losses (gains) on sales and disposals of property and equipment 67 154 (43)
Deferred income taxes 367 2,831 (152)
Excess tax benefits from settlements of stock-based equity awards (671) (1,195) (224)
Stock-based compensation 2,769 3,033 2,864
Unrealized foreign currency exchange losses, net 2,112 469 931
Provision for bad debts 157 162 103
Changes in assets and liabilities:      
Trade accounts receivable 226 (9,776) (1,723)
Inventories (12,347) (2,654) 2,967
Other assets (64) 2,795 (2,738)
Accounts payable and accrued liabilities 3,206 657 6,092
Accrued payroll and related expenses (2,794) (7,802) 6,875
Income taxes payable 1,412 2,661 (346)
Deferred and other long-term liabilities (545) (2,145) 1,475
Net cash provided by operating activities 34,249 30,009 56,424
Investing activities:      
Purchases of property and equipment (3,765) (2,875) (1,769)
Proceeds from sales of property and equipment 1,167 170 216
Purchases of short-term investments (1,029) (515) 0
Maturities of short-term investments 514 0 0
Net cash used in investing activities (3,113) (3,220) (1,553)
Financing activities:      
Repayments of long-term debt (10,715) (10,714) (10,714)
Proceeds from revolving credit facility 114,550 5,000 0
Repayments of revolving credit facility (69,550) (5,000) 0
Dividends paid (18,228) (18,230) (16,657)
Proceeds from issuance of common stock 7,030 20,215 3,572
Treasury stock purchases (39,840) (41,399) 0
Excess tax benefits from settlements of stock-based equity awards 671 1,195 224
Net cash used in financing activities (16,082) (48,933) (23,575)
Effect of exchange rate changes on cash and cash equivalents (1,728) 2,609 (1,324)
Net increase (decrease) in cash and cash equivalents 13,326 (19,535) 29,972
Cash and cash equivalents at beginning of period 56,393 75,928 45,956
Cash and cash equivalents at end of period 69,719 56,393 75,928
Cash paid for:      
Interest 642 986 1,767
Income taxes, net of tax refunds received $ 13,240 $ 11,424 $ 18,948