Detail of Selected Balance Sheet Accounts (Tables)

3 Months Ended

Dec. 31, 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 December 31,
	2015			2014
Balance at beginning of period...................................	$	746		$	1,577
Bad debt expense............................................		248			283
Uncollectible accounts written off, net of recoveries.....................		26			(2	)
Change in foreign currency translation..............................		(10	)		(14	)
Balance at end of period.......................................	$	1,010		$	1,844

Components of Inventories

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

	December 31, 2015		September 30, 2015
Raw materials, parts and subassemblies, net..............................	$	33,552	$	31,807
Work-in-progress................................................		693		1,084
Total inventories................................................	$	34,245	$	32,891

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):

	December 31, 2015			September 30, 2015
Costs incurred on uncompleted contracts....................................	$	934,278		$	912,237
Estimated earnings..................................................		274,099			271,640
		1,208,377			1,183,877
Less: Billings to date.................................................		(1,152,518	)		(1,121,141	)
Net underbilled position...............................................	$	55,859		$	62,736
Included in the accompanying balance sheets under the following captions:
Costs and estimated earnings in excess of billings on uncompleted contracts – underbilled...	$	99,266		$	104,793
Billings in excess of costs and estimated earnings on uncompleted contracts – overbilled....		(43,407	)		(42,057	)
Net underbilled position...............................................	$	55,859		$	62,736

Activity in Product Warranty Accrual

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

	Three months ended December 31,
	2015			2014
Balance at beginning of period..............................................	$	4,930		$	4,557
Increase to warranty expense...............................................		1,326			537
Deduction for warranty charges..............................................		(1,100	)		(524	)
Change in foreign currency translation.........................................		(51	)		(90	)
Balance at end of period..................................................	$	5,105		$	4,480