Balance Sheet Details (Tables)

6 Months Ended

Mar. 31, 2013

Balance Sheet Details

Schedule of components of accounts receivable

The components of accounts receivable are as follows (in thousands):

	March 31,			September 30,
	2013			2012
Trade and other receivables	$	21,060		$	17,543
Long-term contracts:
Billed	108,774			91,132
Unbilled	305,713			264,555
Allowance for doubtful accounts	(651		)	(463		)
Total accounts receivable	434,896			372,767
Less estimated amounts not currently due	(20,830		)	(22,070		)
Current accounts receivable	$	414,066		$	350,697

Components of inventories

Inventories consist of the following (in thousands):

	March 31,			September 30,
	2013			2012
Work in process and inventoried costs under long-term contracts	$	71,885		$	78,796
Customer advances	(21,601		)	(27,288		)
Raw material and purchased parts	708			858
Net inventories	$	50,992		$	52,366