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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2016
Aug. 31, 2015
Aug. 31, 2014
Operating activities:      
Net income $ 52,628 $ 44,807 $ 43,746
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 6,465 6,464 5,860
Net gains on sales and disposals of property and equipment (75) (71) (39)
Deferred income taxes (2,227) (1,334) (736)
Excess tax benefits from settlements of stock-based equity awards (2,064) (1,205) (831)
Stock-based compensation 3,655 2,782 2,263
Unrealized foreign currency exchange (gains) losses, net (986) 2,086 (66)
Provision for bad debts 52 302 218
Changes in assets and liabilities:      
Trade accounts receivable (9,936) (314) (5,821)
Inventories (1,001) 2,037 (2,237)
Other assets 1,557 1,731 (2,209)
Accounts payable and accrued liabilities 2,871 (2,464) (560)
Accrued payroll and related expenses 5,486 (2,722) (3,047)
Income taxes payable 4,235 2,737 2,001
Other long-term liabilities (56) 228 188
Net cash provided by operating activities 60,604 55,064 38,730
Investing activities:      
Purchases of property and equipment (4,354) (5,784) (4,085)
Proceeds from sales of property and equipment 301 333 331
Purchases of intangible assets     (1,799)
Acquisition of business (4,117)
Purchases of short-term investments (24,899) (10,575) (7,710)
Maturities of short-term investments 8,032 3,192 2,760
Net cash used in investing activities (20,920) (16,951) (10,503)
Financing activities:      
Treasury stock purchases (32,131) (30,259) (42,773)
Dividends paid (23,669) (21,720) (20,184)
Proceeds from issuance of common stock 1,200 2,111 1,284
Excess tax benefits from settlements of stock-based equity awards 2,064 1,205 831
Net proceeds from revolving credit facility 14,000 10,000 35,000
Net cash used in financing activities (38,536) (38,663) (25,842)
Effect of exchange rate changes on cash and cash equivalents (4,153) (3,357) 1,984
Net (decrease) increase in cash and cash equivalents (3,005) (3,907) 4,369
Cash and cash equivalents at beginning of period 53,896 57,803 53,434
Cash and cash equivalents at end of period 50,891 53,896 57,803
Cash paid for:      
Interest 1,573 1,168 915
Income taxes, net of tax refunds received $ 16,494 $ 15,414 $ 18,147