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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Cash flows from operating activities:      
Net income $ 3,810 $ 9,032 $ 26,897
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 22,156 23,819 24,842
Amortization of held-to-maturity investments 2,023 1,757 1,195
Bad debt expense 4,762 5,790 8,679
Stock-based compensation 6,224 6,492 6,279
Excess tax benefit from stock-based compensation 0 (159) (1,081)
Deferred income taxes (3,793) (8,490) 2,296
Training equipment credits earned, net (1,926) (1,127) (1,501)
Loss on disposal of property and equipment 184 203 957
Changes in assets and liabilities:      
Receivables (1,258) (10,109) (1,240)
Prepaid expenses and other current assets 1,486 (3,520) 391
Other assets (1,223) (1,227) (1,486)
Accounts payable and accrued expenses (700) 3,037 (15,009)
Deferred revenue (5,674) (8,830) (1,882)
Income tax payable/receivable (665) (1,288) 3,279
Accrued tool sets and other current liabilities 896 (96) 231
Deferred rent liability (1,014) 1,147 6,178
Other liabilities 1,445 2,078 (953)
Net cash provided by operating activities 26,733 18,509 58,072
Cash flows from investing activities:      
Purchase of property and equipment (9,352) (11,342) (29,098)
Proceeds from disposal of property and equipment 54 6 64
Purchase of investments (111,848) (92,503) (89,538)
Proceeds received upon maturity of investments 104,094 90,640 64,585
Proceeds from note receivable 0 615 0
Investment in joint venture 0 (4,000) 0
Restricted cash (3,709) 0 0
Net cash used in investing activities (20,761) (16,584) (53,987)
Cash flows from financing activities:      
Payment of cash dividends (9,820) (7,425) 0
Payment of payroll taxes on stock-based compensation through shares withheld (1,263) (1,365) (1,739)
Proceeds from issuance of common stock under employee plans 525 550 1,269
Excess tax benefit from stock-based compensation 0 159 1,081
Purchase of treasury stock (5,422) (1,849) 0
Net cash (used in) provided by financing activities (15,980) (9,930) 611
Net (decrease) increase in cash and cash equivalents (10,008) (8,005) 4,696
Cash and cash equivalents, beginning of period 45,665 53,670 48,974
Cash and cash equivalents, end of period 35,657 45,665 53,670
Supplemental disclosure of cash flow information:      
Taxes paid 7,467 15,708 12,615
Training equipment obtained in exchange for services 1,164 1,921 1,399
Change in accrued capital expenditures during the period (1,088) 933 (2,434)
Construction in progress financed by construction liability during the period 25,211 2,421 0
Stock based compensation classified as liability instruments $ 310 $ 0 $ 0