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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Operating Activities:      
Net income $ 9,439 $ 29,224 $ 42,076
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 13,120 11,386 8,519
Amortization 435 779 1,671
Gain on sale of discontinued operations, net of tax   (8,563)  
Stock-based compensation 3,171 3,385 4,464
Excess tax benefit from stock-based compensation 191 (407) (464)
Bad debt expense/(recovery) (29) 1,074 (544)
Deferred income tax expense (benefit) 10,521 (3,212) (6,720)
Gain on amended supply agreement (2,029) (1,522)  
Cash received from amended supply agreement 2,333 10,000  
Changes in operating assets and liabilities:      
Accounts receivable, net 391 1,959 5,838
Costs and billings in excess of estimates on uncompleted contracts (17,430) (17,089) 23,054
Inventories (572) (3,959) 3,881
Prepaid expenses and other current assets 2,656 (1,101) (3,530)
Accounts payable and income taxes payable (5,073) 1,002 13,029
Accrued liabilities (3,373) (4,997) (633)
Other, net (833) 1,524 784
Net assets held for sale   (10,355)  
Net cash provided by operating activities 12,918 9,128 91,425
Investing Activities:      
Proceeds from sale of property, plant and equipment 112 118 885
Proceeds from sale of Transdyn   14,819  
Purchases of property, plant and equipment (34,719) (16,495) (74,369)
Net cash used in investing activities (34,607) (1,558) (73,484)
Financing Activities:      
Payments on industrial development revenue bonds (400) (400) (400)
Excess tax benefit from stock-based compensation (191) 407 464
Shares withheld in lieu of employee tax withholding (740) (499) (187)
Purchase of treasury shares (21,259)    
Dividends paid (12,358) (11,998)  
Payments on short-term and other financing   (16) (329)
Net cash used in financing activities (34,948) (12,506) (452)
Net increase (decrease) in cash and cash equivalents (56,637) (4,936) 17,489
Effect of exchange rate changes on cash and cash equivalents (2,912) 643 (118)
Cash and cash equivalents, beginning of period 103,118 107,411 90,040
Cash and cash equivalents, end of period $ 43,569 $ 103,118 $ 107,411