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Detail of Certain Balance Sheet Accounts (Tables) | 12 Months Ended
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Sep. 30, 2019
Detail of Certain Balance Sheet Accounts [Abstract] |
Accounts Receivable, Allowance for Credit Loss [Table Text Block] |
| Year Ended September 30,
| 2019 |  | 2018
Balance at beginning of period | $ | 868 |  |  | $ | 650 |
Additions to costs and expenses | 552 |  |  | 515 |
Deductions for uncollectible receivables written off, net of recoveries | (236 | ) |  | (297 | )
Balance at end of period | $ | 1,184 |  |  | $ | 868 |
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] |
| Year Ended September 30,
| 2019 |  | 2018
Accounts payable, trade | $ | 85,276 |  |  | 75,293
Accrued compensation and benefits | 42,828 |  |  | 34,058
Accrued insurance liabilities | 6,683 |  |  | 6,202
Other accrued expenses | 18,122 |  |  | 15,038
| $ | 152,909 |  |  | 130,591
Schedule of Other Assets [Table Text Block] |
| Year Ended September 30,
| 2019 |  | 2018
Executive Savings Plan assets | $ | 763 |  |  | $ | 747 |
Securities and equity investments | 408 |  |  | 558 |
Other | 3,767 |  |  | 4,760 |
Total | $ | 4,938 |  |  | $ | 6,065 |

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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 allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 + 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 Tabular disclosure of the carrying amounts of other assets. This disclosure includes other current assets and other noncurrent assets. + References No definition available. + Details
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