Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Operating Activities:
Net income	$ 8,255	$ 7,385
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	2,562	2,657
Amortization	416	415
Stock-based compensation	1,185	942
Bad debt expense (recovery)	15	(293)
Deferred income tax benefit	(2,362)	(180)
Changes in operating assets and liabilities:
Accounts receivable, net	7,577	7,569
Costs and billings in excess of estimates on uncompleted contracts	(13,399)	24,099
Inventories	405	1,611
Prepaid expenses and other current assets	1,631	798
Accounts payable and income taxes payable	1,053	(11,459)
Accrued liabilities	(12,145)	(12,338)
Other, net	10,156	(2)
Net cash provided by operating activities	5,349	21,204
Investing Activities:
Proceeds from sale of property, plant and equipment		24
Purchases of property, plant and equipment	(5,764)	(13,375)
Net cash used in investing activities	(5,764)	(13,351)
Financing Activities:
Payments on industrial development revenue bonds	(400)	(400)
Taxes on stock-based compensation	(524)
Dividends paid	(2,993)
Payments on short-term and other financing	(16)	(275)
Net cash used in financing activities	(3,933)	(675)
Net increase (decrease) in cash and cash equivalents	(4,348)	7,178
Effect of exchange rate changes on cash and cash equivalents	661	149
Cash and cash equivalents, beginning of period	107,411	90,040
Cash and cash equivalents, end of period	$ 103,724	$ 97,367