Annual report pursuant to Section 13 and 15(d)

Billed and unbilled receivables (Details)

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Billed and unbilled receivables (Details) (USD $)
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Changes in the reserves against current billed accounts receivable      
Contractual retainage provisions $ 8,800,000 $ 8,300,000  
Accounts receivable, billed and unbilled
     
Changes in the reserves against current billed accounts receivable      
Balance at beginning of year 3,828,000 3,975,000 3,265,000
Additions to reserve 1,767,000 2,334,000 2,061,000
Deductions (2,457,000) (2,481,000) (1,351,000)
Balance at end of year $ 3,138,000 $ 3,828,000 $ 3,975,000