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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
May. 31, 2015
May. 31, 2014
Operating activities:    
Net income $ 33,084 $ 32,205
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 4,824 4,337
Net gains on sales and disposals of property and equipment (82) (41)
Deferred income taxes (1,229) (330)
Excess tax benefits from settlements of stock-based equity awards (906) (824)
Stock-based compensation 2,205 1,942
Unrealized foreign currency exchange losses (gains), net 2,393 (159)
Provision for bad debts 214 174
Changes in assets and liabilities:    
Trade and other accounts receivable (3,787) (3,681)
Inventories 1,078 (4,716)
Other assets 3,817 (1,616)
Accounts payable and accrued liabilities (1,596) 21
Accrued payroll and related expenses (5,003) (6,924)
Income taxes payable 130 1,718
Other long-term liabilities 184 17
Net cash provided by operating activities 35,326 22,123
Investing activities:    
Purchases of property and equipment (4,068) (3,023)
Proceeds from sales of property and equipment 420 250
Purchase of intangible assets   (1,789)
Acquisition of business (3,705)  
Purchases of short-term investments (8,167) (5,756)
Maturities of short-term investments 1,636 914
Net cash used in investing activities (13,884) (9,404)
Financing activities:    
Treasury stock purchases (25,886) (30,482)
Dividends paid (16,177) (15,096)
Proceeds from issuance of common stock 1,483 1,265
Excess tax benefits from settlements of stock-based equity awards 906 824
Proceeds from revolving credit facility 10,000 20,000
Net cash used in financing activities (29,674) (23,489)
Effect of exchange rate changes on cash and cash equivalents (2,654) 2,231
Net decrease in cash and cash equivalents (10,886) (8,539)
Cash and cash equivalents at beginning of period 57,803 53,434
Cash and cash equivalents at end of period $ 46,917 $ 44,895