Detail of Selected Balance Sheet Accounts (Tables)

9 Months Ended

Jun. 30, 2015

Disclosure Text Block Supplement [Abstract]

Activity in Allowance for Doubtful Accounts

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

	Three months ended June 30,						Nine months ended June 30,
	2015			2014			2015			2014
Balance at beginning of period	$	1,881		$	501		$	1,577		$	572
Bad debt expense/(recovery)		(438	)		676			31			616
Uncollectible accounts written off, net of recoveries		(145	)		(38	)		(267	)		(46	)
Change in foreign currency translation		14			5			(29	)		2
Balance at end of period	$	1,312		$	1,144		$	1,312		$	1,144

Components of Inventories

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

	June 30, 2015			September 30, 2014
Raw materials, parts and subassemblies	$	40,320		$	35,349
Work-in-progress		1,029			2,035
Provision for excess and obsolete inventory		(4,997	)		(4,569	)
Total inventories	$	36,352		$	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):

	June 30,			September 30,
	2015			2014
Costs incurred on uncompleted contracts	$	613,304		$	604,939
Estimated earnings		162,292			157,562
		775,596			762,501
Less: Billings to date		(735,012	)		(715,233	)
Net underbilled position	$	40,584		$	47,268
Included in the accompanying balance sheets under the following captions:
Costs and estimated earnings in excess of billings on uncompleted contracts – underbilled	$	97,901		$	95,970
Billings in excess of costs and estimated earnings on uncompleted contracts – overbilled		(57,317	)		(48,702	)
Net underbilled position	$	40,584		$	47,268

Activity in Product Warranty Accrual

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

	Three months ended June 30,						Nine months ended June 30,
	2015			2014			2015			2014
Balance at beginning of period	$	4,375		$	4,833		$	4,557		$	5,282
Increase to warranty expense		1,033			884			2,100			2,390
Deduction for warranty charges		(766	)		(1,023	)		(1,794	)		(2,949	)
Increase (decrease) due to foreign currency translations		81			61			(140	)		32
Balance at end of period	$	4,723		$	4,755		$	4,723		$	4,755