CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Operating Activities:
Net income (loss)	$ 42,076	$ 29,657	$ (2,715)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	8,519	10,465	10,598
Amortization	1,671	2,612	4,848
Impairments			7,158
Stock-based compensation	4,464	1,723	99
Bad debt expense (recovery)	(544)	842	(114)
Deferred income tax benefit	(6,720)	(1,422)	(425)
Gain on sale of investment			(1,229)
Changes in operating assets and liabilities:
Accounts receivable, net	5,838	(16,209)	(17,616)
Costs and estimated earnings in excess of billings on uncompleted contracts	(165)	(34,755)	(13,519)
Inventories	3,881	3,948	1,542
Prepaid expenses and other current assets	(3,530)	4,821	4,514
Other assets	(847)	(13)	(2,627)
Accounts payable and income taxes payable	12,565	(6,036)	14,487
Accrued liabilities	(633)	6,411	(4,255)
Billings in excess of costs and estimated earnings on uncompleted contracts	23,219	(7,492)	13,553
Other, net	1,968	(517)	1,188
Net cash provided by (used in) operating activities	91,762	(5,965)	15,487
Investing Activities:
Proceeds from sale of property, plant and equipment	885	195	354
Purchases of property, plant and equipment	(74,369)	(29,063)	(7,347)
Proceeds from sale of investment			1,229
Decrease in cash held in escrow		1,000
Increase in cash held in escrow			(1,000)
Net cash used in investing activities	(73,484)	(27,868)	(6,764)
Financing Activities:
Borrowings on Canadian revolving line of credit	5,234	7,992	7,810
Payments on Canadian revolving line of credit	(5,234)	(7,992)	(7,818)
Payments on industrial development revenue bonds	(400)	(400)	(400)
Payments on short-term and other financing	(329)	(717)	(1,068)
Proceeds from exercise of stock options		1,799	495
Excess tax benefit from stock-based compensation	277	589	180
Net cash provided by (used in) financing activities	(452)	1,271	(801)
Net increase (decrease) in cash and cash equivalents	17,826	(32,562)	7,922
Effect of exchange rate changes on cash and cash equivalents	(118)	(864)	191
Cash and cash equivalents at beginning of year	90,040	123,466	115,353
Cash and cash equivalents at end of year	$ 107,748	$ 90,040	$ 123,466