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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
May 31, 2014
May 31, 2013
Operating activities:    
Net income $ 32,205 $ 31,672
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 4,337 3,765
Net gains on sales and disposals of property and equipment (41) (12)
Deferred income taxes (330) 451
Excess tax benefits from settlements of stock-based equity awards (824) (666)
Stock-based compensation 1,942 1,859
Unrealized foreign currency exchange losses (gains), net (159) 1,326
Provision for bad debts 174 399
Changes in assets and liabilities:    
Trade accounts receivable (3,681) (4,395)
Inventories (4,716) (4,421)
Other assets (1,616) 144
Accounts payable and accrued liabilities 21 276
Accrued payroll and related expenses (6,924) 4,138
Income taxes payable 1,718 1,495
Deferred and other long-term liabilities 17 127
Net cash provided by operating activities 22,123 36,158
Investing activities:    
Purchases of property and equipment (3,023) (1,975)
Proceeds from sales of property and equipment 250 112
Purchases of intangible assets (1,789)  
Purchases of short-term investments (5,756) (36,424)
Maturities of short-term investments 914 1,029
Net cash used in investing activities (9,404) (37,258)
Financing activities:    
Proceeds from revolving credit facility 20,000 18,000
Dividends paid (15,096) (14,263)
Proceeds from issuance of common stock 1,265 3,213
Treasury stock purchases (30,482) (22,294)
Excess tax benefits from settlements of stock-based equity awards 824 666
Net cash used in financing activities (23,489) (14,678)
Effect of exchange rate changes on cash and cash equivalents 2,231 (1,668)
Net decrease in cash and cash equivalents (8,539) (17,446)
Cash and cash equivalents at beginning of period 53,434 69,719
Cash and cash equivalents at end of period $ 44,895 $ 52,273