Receivables (Tables)

12 Months Ended

Sep. 30, 2014

Receivables [Abstract]

Receivables

Receivables at September 30, 2014 and 2013 consisted of the following:

	September 30,
	2014			2013
	(In thousands)
Billed	$	123,083		$	115,640
Unbilled (1)	35,139			31,250
	158,222			146,890
Less: allowance for doubtful accounts	(2,927		)	(3,157		)
Receivables, net	$	155,295		$	143,733

(1) Represents revenue recorded in excess of amounts billable pursuant to contract provisions and generally become billable at contractually specified dates or upon the attainment of milestones. Unbilled amounts are expected to be realized within one year.

Activity of Allowance for Doubtful Accounts

Activity in the allowance for doubtful accounts was as follows:

	Year Ended September 30,
	2014			2013
	(In thousands)
Balance, beginning of year	$	3,157		$	3,406
Add: expense	1,485			327
Less: write-offs (net of recoveries)	(1,715		)	(576		)
Balance, end of year	$	2,927		$	3,157