Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating Activities:
Net income (loss)	$ (3,922)us-gaap_NetIncomeLoss	$ 23,847us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	6,562us-gaap_Depreciation	5,059us-gaap_Depreciation
Amortization	232us-gaap_AdjustmentForAmortization	536us-gaap_AdjustmentForAmortization
Gain on sale of discontinued operations, net of tax		(8,563)
Stock-based compensation	1,567us-gaap_ShareBasedCompensation	2,001us-gaap_ShareBasedCompensation
Bad debt expense (recovery)	469	(60)
Deferred income tax expense (benefit)	7,549us-gaap_DeferredIncomeTaxExpenseBenefit	(2,823)us-gaap_DeferredIncomeTaxExpenseBenefit
Gain on amended supply agreement	(1,015)	(507)
Cash received from amended supply agreement	2,333	10,000
Changes in operating assets and liabilities:
Accounts receivable, net	(18,321)	(10,472)
Costs and billings in excess of estimates on uncompleted contracts	13,050	(4,840)
Inventories	(3,360)us-gaap_IncreaseDecreaseInInventories	(495)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	1,613	959
Accounts payable and income taxes payable	(3,564)	(10,407)
Accrued liabilities	(6,845)	(11,307)
Other, net	(450)	294
Net cash used in operating activities	(4,102)	(6,778)
Investing Activities:
Proceeds from sale of property, plant and equipment	43	60
Proceeds from sale of Transdyn		14,819
Purchases of property, plant and equipment	(28,692)	(8,464)
Net cash provided by (used in) investing activities	(28,649)	6,415
Financing Activities:
Payments on industrial development revenue bonds	(400)us-gaap_RepaymentsOfLongTermDebt	(400)us-gaap_RepaymentsOfLongTermDebt
Cash paid for employee taxes in lieu of shares	(557)	(499)
Purchase of treasury shares	(5,759)
Dividends paid	(6,264)us-gaap_PaymentsOfDividendsCommonStock	(5,992)us-gaap_PaymentsOfDividendsCommonStock
Payments on short-term and other financing		(16)
Net cash used in financing activities	(12,980)	(6,907)
Net increase (decrease) in cash and cash equivalents	(45,731)	(7,270)
Effect of exchange rate changes on cash and cash equivalents	(1,715)	1,252
Cash and cash equivalents, beginning of period	103,118	107,411
Cash and cash equivalents, end of period	$ 55,672	$ 101,393

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