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Detail Of Certain Balance Sheet Accounts | 12 Months Ended
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Sep. 30, 2017
Detail Of Certain Balance Sheet Accounts [Abstract] |
Detail Of Certain Balance Sheet Accounts | 6. DETAIL OF CERTAIN BALANCE SHEET ACCOUNTS Activity in our allowance for doubtful accounts on accounts and receivables consists of the following:
|  |  | Years Ended September 30,
|  |  | 2017 |  | 2016
Balance at beginning of period |  | $ | 736 |  | $ | 842
Additions to costs and expenses |  |  | 294 |  |  | 360
Deductions for uncollectible receivables written off, net of recoveries |  |  | (380) |  |  | (466)
Balance at end of period |  | $ | 650 |  | $ | 736
Accounts payable and accrued expenses consist of the following:
|  | Years Ended September 30,
|  | 2017 |  | 2016
Accounts payable, trade |  | $ | 63,246 |  | $ | 64,963
Accrued compensation and benefits |  |  | 33,561 |  |  | 26,827
Accrued insurance liabilities |  |  | 6,204 |  |  | 5,464
Other accrued expenses |  |  | 17,699 |  |  | 11,568
|  | $ | 120,710 |  | $ | 108,822
Contracts in progress are as follows:
|  | Years Ended September 30,
|  | 2017 |  | 2016
Costs incurred on contracts in progress |  | $ | 486,950 |  | $ | 409,075
Estimated earnings |  |  | 55,606 |  |  | 48,618
|  |  | 542,556 |  |  | 457,693
Less--Billings to date |  |  | (559,036) |  |  | (466,368)
Net contracts in progress |  | $ | (16,480) |  | $ | (8,675)
Costs and estimated earnings in excess of billings |  |  | 13,438 |  |  | 15,554
Less--Billings in excess of costs and estimated earnings |  |  | (29,918) |  |  | (24,229)
Net contracts in progress |  | $ | (16,480) |  | $ | (8,675)
Other non-current assets are comprised of the following:
|  | Years Ended September 30,
|  | 2017 |  | 2016
Executive Savings Plan assets |  |  | 641 |  |  | 599
Securities and equity investments |  |  | 558 |  |  | 919
Other |  |  | 2,583 |  |  | 2,192
Total |  | $ | 3,782 |  | $ | 3,710
Securities and Equity Investments At September 30, 2017, and 2016, we held an investment in EnerTech Capital Partners II L.P. (“EnerTech”), a private investment fund. As our investment was 2.21% of the overall ownership in EnerT ech at September 30, 2017, and 2016, we account for this investment using the cost method of accounting. EnerTech’s investment portfolio from time to time results in unrealized losses ref lecting a possible, other-than-temporary, i mpairment of our investment. During the year ended September 30, 2017, we collected a distribution of $361, reducing the carrying value of our investment. The carrying value of our investment in EnerTech at September 30, 2017, and 2016 was $558, and $919, respec tively. The following table presents the reconciliation of the carrying value and unrealized gains (losses) to the fair value of the investment in EnerTech as of September 30, 2017, and 2016:
|  | Years Ended September 30,
|  | 2017 |  | 2016
Carrying value |  | $ | 558 |  | $ | 919
Unrealized gains |  |  | 171 |  |  | 159
Fair value |  | $ | 729 |  | $ | 1,078
At each reporting date, the Company performs an evaluation of impairment for securities to determine if any unrealized losses are other-than-temporary. For equity securities, this evaluation considers a number of factors including, but not limited to, the length of time and extent to which the fair value has been less than cost, the financial condition and near term prospects of the issuer and management’s ability and intent to hold the securities until fair value recovers. The assessment of the ability and intent to hold these securities to recovery focuses on liquidity needs, asset and liability management obj ectives and securities portfolio objectives. Based on the results of this evaluation, we believe the unrealized gain at September 30, 2017 indicated our investment was not impaired. In December 2016, EnerTech’s general partner, with the conse nt of the fund’s investors, extended th e fund through December 31, 2017. The fund is expected to terminate on this date unless extended by the fund’s valuation committee. The fund may be extended for another one-year period through Decemb er 31, 2018, with the consent of the fund’s valuation committee.

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