Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating Activities:
Net income	$ 10,002	$ 3,127
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	9,801	9,894
Amortization	263	345
Stock-based compensation	4,235	2,262
Bad debt expense	221	31
Deferred income tax expense	1,463	8,652
Gain on amended supply agreement	(1,522)	(1,522)
Cash received from amended supply agreement	2,333	2,333
Changes in operating assets and liabilities:
Accounts receivable, net	13,455	(5,837)
Costs and billings in excess of estimated earnings on uncompleted contracts	25,337	5,598
Inventories	4,639	(3,809)
Prepaid expenses and other current assets	597	2,075
Accounts payable and income taxes payable	(11,282)	308
Accrued liabilities	2,310	(4,336)
Other, net	(52)	(533)
Net cash provided by operating activities	61,800	18,588
Investing Activities:
Proceeds from sale of property, plant and equipment	122	51
Purchases of property, plant and equipment	(2,000)	(34,246)
Net cash used in investing activities	(1,878)	(34,195)
Financing Activities:
Payments on industrial development revenue bonds	(400)	(400)
Shares withheld in lieu of employee tax withholding	(1,000)	(557)
Purchase of treasury shares	(3,740)	(12,523)
Dividends paid	(8,882)	(9,326)
Net cash used in financing activities	(14,022)	(22,806)
Net increase (decrease) in cash and cash equivalents	45,900	(38,413)
Effect of exchange rate changes on cash and cash equivalents	(118)	(1,346)
Cash and cash equivalents, beginning of period	43,569	103,118
Cash and cash equivalents, end of period	$ 89,351	$ 63,359