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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Operating activities:      
Net income $ 52,930 $ 52,628 $ 44,807
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 6,769 6,465 6,464
Net gains on sales and disposals of property and equipment (115) (75) (71)
Deferred income taxes 1,608 (2,227) (1,334)
Excess tax benefits from settlements of stock-based equity awards (1,539) (2,064) (1,205)
Stock-based compensation 4,138 3,655 2,782
Unrealized foreign currency exchange losses (gains), net 364 (986) 2,086
Provision for bad debts (138) 52 302
Changes in assets and liabilities:      
Trade accounts receivable 482 (9,936) (314)
Inventories (3,487) (1,001) 2,037
Other assets (3,514) 1,557 1,731
Accounts payable and accrued liabilities 2,827 2,871 (2,464)
Accrued payroll and related expenses (8,328) 5,486 (2,722)
Income taxes payable 605 4,235 2,737
Other long-term liabilities (265) (56) 228
Net cash provided by operating activities 52,337 60,604 55,064
Investing activities:      
Purchases of property and equipment (20,150) (4,354) (5,784)
Proceeds from sales of property and equipment 430 301 333
Acquisition of business (4,117)
Purchases of short-term investments (27,136) (24,899) (10,575)
Maturities of short-term investments 4,565 8,032 3,192
Net cash used in investing activities (42,291) (20,920) (16,951)
Financing activities:      
Treasury stock purchases (31,109) (32,131) (30,259)
Dividends paid (26,808) (23,669) (21,720)
Proceeds from issuance of common stock 775 1,200 2,111
Excess tax benefits from settlements of stock-based equity awards 1,539 2,064 1,205
Net proceeds from revolving credit facility 32,000 14,000 10,000
Net cash used in financing activities (23,603) (38,536) (38,663)
Effect of exchange rate changes on cash and cash equivalents (252) (4,153) (3,357)
Net decrease in cash and cash equivalents (13,809) (3,005) (3,907)
Cash and cash equivalents at beginning of period 50,891 53,896 57,803
Cash and cash equivalents at end of period 37,082 50,891 53,896
Cash paid for:      
Interest 2,625 1,573 1,168
Income taxes, net of tax refunds received $ 21,933 $ 16,494 $ 15,414