Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating Activities:
Net income	$ 23,508	$ 17,804
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	6,523	7,703
Amortization	1,252	2,121
Stock-based compensation	3,247	894
Bad debt expense (recoveries)	(310)	509
Deferred income taxes	(287)	(273)
Changes in operating assets and liabilities:
Accounts receivable, net	12,777	2,071
Costs and estimated earnings in excess of billings on uncompleted contracts	12,372	(35,423)
Inventories	1,976	(3,961)
Income tax receivable, prepaid expenses and other current assets	(2,216)	7,109
Accounts payable and income taxes payable	6,763	(1,257)
Accrued liabilities	(6,035)	490
Billings in excess of costs and estimated earnings on uncompleted contracts	30,320	8,880
Other	(1,224)	(208)
Net cash provided by operating activities	88,666	6,459
Investing Activities:
Proceeds from sale of property, plant and equipment	711	158
Purchases of property, plant and equipment	(53,728)	(25,546)
Decrease in cash held in escrow		1,000
Net cash used in investing activities	(53,017)	(24,388)
Financing Activities:
Borrowings on Canadian revolving line of credit	4,583	7,992
Payments on Canadian revolving line of credit	(4,583)	(7,992)
Payments on industrial development revenue bonds	(400)	(400)
Short-term financing and other	(316)	1,822
Net cash (used in) provided by financing activities	(716)	1,422
Net increase in cash and cash equivalents	34,933	(16,507)
Effect of exchange rate changes on cash and cash equivalents	(108)	(124)
Cash and cash equivalents, beginning of period	90,040	123,466
Cash and cash equivalents, end of period	$ 124,865	$ 106,835