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Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010
Operating Activities: |  |  |
Net income (loss) | $ 29,657 | $ (2,715) | $ 25,167
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Depreciation | 10,465 | 10,598 | 9,154
Amortization | 2,612 | 4,848 | 4,549
Impairments |  | 7,158 | 7,452
Stock-based compensation | 1,723 | 99 | 1,929
Bad debt expense (recovery) | 842 | (114) | 410
Deferred income taxes | (1,422) | (425) | (348)
Gain on sale of investment |  | (1,229) |
Changes in operating assets and liabilities: |  |  |
Accounts receivable, net | (16,209) | (17,616) | 39,687
Costs and estimated earnings in excess of billings on uncompleted contracts | (34,755) | (13,519) | 8,243
Inventories | 3,948 | 1,542 | 12,320
Prepaid expenses and other current assets | 4,821 | 4,514 | (5,813)
Other assets | (13) | (2,627) | 440
Accounts payable and income taxes payable | (6,036) | 14,487 | (20,281)
Accrued liabilities | 6,411 | (4,255) | (5,392)
Billings in excess of costs and estimated earnings on uncompleted contracts | (7,492) | 13,553 | (13,762)
Other, net | (517) | 1,188 | 378
Net cash provided (used in) by operating activities | (5,965) | 15,487 | 64,133
Investing Activities: |  |  |
Proceeds from sale of property, plant and equipment | 195 | 354 | 14
Purchases of property, plant and equipment | (29,063) | (7,347) | (4,420)
Proceeds from sale of investment |  | 1,229 |
Decrease in cash held in escrow | 1,000 |  |
Increase in cash held in escrow |  | (1,000) |
Purchase of noncontrolling interest - Powell Asia |  |  | (659)
Acquisition of Powell Canada |  |  | (23,394)
Net cash used in investing activities | (27,868) | (6,764) | (28,459)
Financing Activities: |  |  |
Borrowings on Canadian revolving line of credit | 7,992 | 7,810 | 891
Payments on Canadian revolving line of credit | (7,992) | (7,818) | (13,984)
Payments on Canadian term loan |  |  | (2,429)
Payments on industrial development revenue bonds | (400) | (400) | (400)
Payments on deferred acquisition payable |  |  | (4,292)
Payments on short term and other financing | (717) | (1,068) | (1,087)
Proceeds from exercise of stock options | 1,799 | 495 | 1,700
Tax benefit from exercise of stock options | 589 | 180 | 209
Net cash provided by (used in) financing activities | 1,271 | (801) | (19,392)
Net increase (decrease) in cash and cash equivalents | (32,562) | 7,922 | 16,282
Effect of exchange rate changes on cash and cash equivalents | (864) | 191 | 1,668
Cash and cash equivalents at beginning of year | 123,466 | 115,353 | 97,403
Cash and cash equivalents at end of year | $ 90,040 | $ 123,466 | $ 115,353

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- Definition The cash outflow associated with the purchase of noncontrolling interest during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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