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Billed and unbilled receivables (Details) (USD $)
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12 Months Ended | ||
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2012
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| Changes in the reserves against current billed accounts receivable | |||
| Contractual retainage provisions | $ 8,800,000 | $ 8,300,000 | |
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Accounts receivable, billed and unbilled
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| 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 |
| X | ||||||||||
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- Definition
Amount billed to customers under long-term contracts or programs that have been withheld because of retainage provisions in a contract. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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