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Detail of Certain Balance Sheet Accounts (Tables) | 12 Months Ended
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Sep. 30, 2017
Detail Of Certain Balance Sheet Accounts [Abstract] |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] |
|  |  | 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
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] |
|  | 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 Progresstable [Text Block] |
|  | 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)
Schedule of Other Assets, Noncurrent [Table Text Block] |
|  | 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
Schedule of Cost Method Investments [Table Text Block] |
|  | Years Ended September 30,
|  | 2017 |  | 2016
Carrying value |  | $ | 558 |  | $ | 919
Unrealized gains |  |  | 171 |  |  | 159
Fair value |  | $ | 729 |  | $ | 1,078

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- Definition Tabular Disclosure that details total cost incurred with contracts in progress, estimated earnings, billings to date, costs and estimated earnings in excess of billings on uncompleted contracts and billings in excess of costs and estimated earnings on uncompleted contracts. + References No definition available. + Details
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- Definition Detail of certain balance sheet accounts [Abstract]. + References No definition available. + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of the (a) carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business (accounts payable); (b) other payables; and (c) accrued liabilities. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). An alternative caption includes accrued expenses. + References No definition available. + Details
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- Definition A tabular disclosure of (a) the aggregate carrying amount of all cost-method investments; (b) the aggregate carrying amount of cost-method investments that the investor did not evaluate for impairment for cost-method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 + Details
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- Definition Tabular disclosure of noncurrent assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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