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Detail of Certain Balance Sheet Accounts (Notes) | 12 Months Ended
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Sep. 30, 2019
Detail of Certain Balance Sheet Accounts [Abstract] |
Detail Of Certain Balance Sheet Accounts [Text Block] | 7. DETAIL OF CERTAIN BALANCE SHEET ACCOUNTS Activity in our allowance for doubtful accounts on accounts receivable consists of the following:
| 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 |
Accounts payable and accrued expenses consist of the following:
| 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
Other non-current assets are comprised of the following:
| 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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