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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Operating activities:    
Net income $ 17,376 $ 18,187
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 2,475 1,844
Net losses on sales and disposals of property and equipment 33 95
Deferred income taxes 383 244
Excess tax benefits from settlements of stock-based equity awards (320) (706)
Stock-based compensation 1,678 1,904
Unrealized foreign currency exchange losses (gains), net 820 (164)
Provision for bad debts 44 31
Changes in assets and liabilities:    
Trade accounts receivable (2,865) (7,136)
Inventories (8,408) (5,182)
Other assets 17 3,580
Accounts payable and accrued liabilities 6,676 2,893
Accrued payroll and related expenses (3,837) (10,142)
Income taxes payable 1,618 2,468
Deferred and other long-term liabilities (516) 43
Net cash provided by operating activities 15,174 7,959
Investing activities:    
Purchases of property and equipment (2,314) (1,286)
Proceeds from sales of property and equipment 1,033 100
Purchases of short-term investments (531) 0
Maturities of short-term investments 516 0
Net cash used in investing activities (1,296) (1,186)
Financing activities:    
Repayments of long-term debt (10,715) (10,714)
Proceeds from revolving credit facility 89,600 0
Repayments of revolving credit facility (49,600) 0
Dividends paid (8,986) (9,159)
Proceeds from issuance of common stock 984 11,531
Treasury stock purchases (22,685) (9,552)
Excess tax benefits from settlements of stock-based equity awards 320 706
Net cash used in financing activities (1,082) (17,188)
Effect of exchange rate changes on cash and cash equivalents (1,494) 2,012
Net increase (decrease) in cash and cash equivalents 11,302 (8,403)
Cash and cash equivalents at beginning of period 56,393 75,928
Cash and cash equivalents at end of period $ 67,695 $ 67,525