Detail of Selected Balance Sheet Accounts (Tables)

12 Months Ended

Sep. 30, 2015

Disclosure Text Block Supplement [Abstract]

Activity in Allowance for Doubtful Accounts

Activity in our allowance for doubtful accounts consisted of the following (in thousands):

	September 30,
	2015			2014
Balance at beginning of period	$	1,577		$	572
Bad debt expense (recovery)		(29	)		1,074
Uncollectible accounts written off, net of recoveries		(749	)		(58	)
Change in foreign currency translation		(53	)		(11	)
Balance at end of period	$	746		$	1,577

Components of Inventories

The components of inventories are summarized below (in thousands):

	September 30,
	2015			2014
Raw materials, parts and subassemblies	$	36,575		$	35,349
Work-in-progress		1,084			2,035
Provision for excess and obsolete inventory		(4,768	)		(4,569	)
Total inventories	$	32,891		$	32,815

Cost and Estimated Earnings on Uncompleted Contracts

The components of costs and estimated earnings and related amounts billed on uncompleted contracts are summarized below (in thousands):

	September 30,
	2015			2014
Costs incurred on uncompleted contracts	$	912,237		$	604,939
Estimated earnings		271,640			157,562
		1,183,877			762,501
Less: Billings to date		(1,121,141	)		(715,233	)
Net underbilled position	$	62,736		$	47,268
Included in the accompanying balance sheets under the following captions:
Costs and estimated earnings in excess of billings on uncompleted contracts – underbilled	$	104,793		$	95,970
Billings in excess of costs and estimated earnings on uncompleted contracts – overbilled		(42,057	)		(48,702	)
Net underbilled position	$	62,736		$	47,268

Schedule of Property, Plant and Equipment

Property, plant and equipment are summarized below (in thousands):

	September 30,						Range of
	2015			2014			Asset Lives
Land	$	22,380		$	23,545		—
Buildings and improvements		120,983			100,901		3 - 39 Years
Machinery and equipment		100,306			100,922		3 - 15 Years
Furniture and fixtures		3,564			3,852		3 - 10 Years
Construction in process		1,013			15,878		—
	$	248,246		$	245,098
Less: Accumulated depreciation		(93,652	)		(88,202	)
Total property, plant and equipment, net	$	154,594		$	156,896

Activity in Product Warranty Accrual

Activity in our product warranty accrual consisted of the following (in thousands):

	September 30,
	2015			2014
Balance at beginning of period	$	4,557		$	5,282
Increase to warranty expense		3,364			3,237
Deduction for warranty charges		(2,738	)		(3,892	)
Increase (decrease) due to foreign currency translations		(253	)		(70	)
Balance at end of period	$	4,930		$	4,557