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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2011
Operating activities:      
Net income $ 39,813 $ 35,485 $ 36,433
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 5,359 4,869 4,386
Impairment of definite-lived intangible assets 1,077      
Net losses on sales and disposals of property and equipment 3 67 154
Deferred income tax (1,004) 367 2,831
Excess tax benefits from settlements of stock-based equity awards (850) (671) (1,195)
Stock-based compensation 2,453 2,769 3,033
Unrealized foreign currency exchange losses, net 1,113 2,112 469
Provision for bad debts 511 157 162
Changes in assets and liabilities:      
Trade accounts receivable (3,800) 226 (9,776)
Inventories (2,829) (12,347) (2,654)
Other assets (1,998) (64) 2,795
Accounts payable and accrued liabilities (886) 3,206 657
Accrued payroll and related expenses 10,362 (2,794) (7,802)
Income taxes payable 2,284 1,412 2,661
Deferred and other long-term liabilities (39) (545) (2,145)
Net cash provided by operating activities 51,569 34,249 30,009
Investing activities:      
Purchases of property and equipment (2,854) (3,765) (2,875)
Proceeds from sales of property and equipment 158 1,167 170
Purchases of short-term investments (38,838) (1,029) (515)
Maturities of short-term investments 2,000 514  
Net cash used in investing activities (39,534) (3,113) (3,220)
Financing activities:      
Repayments of long-term debt   (10,715) (10,714)
Proceeds from revolving credit facility 18,000 114,550 5,000
Repayments of revolving credit facility   (69,550) (5,000)
Dividends paid (19,044) (18,228) (18,230)
Proceeds from issuance of common stock 4,791 7,030 20,215
Treasury stock purchases (31,437) (39,840) (41,399)
Excess tax benefits from settlements of stock-based equity awards 850 671 1,195
Net cash used in financing activities (26,840) (16,082) (48,933)
Effect of exchange rate changes on cash and cash equivalents (1,480) (1,728) 2,609
Net (decrease) increase in cash and cash equivalents (16,285) 13,326 (19,535)
Cash and cash equivalents at beginning of period 69,719 56,393 75,928
Cash and cash equivalents at end of period 53,434 69,719 56,393
Supplemental Cash Flow Information [Abstract]      
Interest 698 642 986
Income taxes, net of tax refunds received $ 16,614 $ 13,240 $ 11,424