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Captive Insurance Collateral - Schedule of Captive Insurance Collateral to be Available-for-sale Investments (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |  |
Amortized Cost |  | $ 57,085 | $ 46,623
Gross Unrealized Gain |  | 760 |
Gross Unrealized (Loss) |  | (4) | (1,204)
Fair Value | [1] | 57,841 | 45,419
Cash and Receivables |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Amortized Cost |  | 509 | 350
Fair Value |  | 509 | 350
U.S. Government Sponsored Agencies |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Amortized Cost |  | 27,593 | 10,735
Gross Unrealized Gain |  | 185 |
Gross Unrealized (Loss) |  | (4) | (192)
Fair Value |  | 27,774 | 10,543
Corporate Debt Securities |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Amortized Cost |  | 24,904 | 30,427
Gross Unrealized Gain |  | 536 |
Gross Unrealized (Loss) |  |  | (928)
Fair Value |  | 25,440 | 29,499
Foreign Bonds and Notes |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Amortized Cost |  | 4,079 | 5,111
Gross Unrealized Gain |  | 39 |
Gross Unrealized (Loss) |  |  | (84)
Fair Value |  | $ 4,118 | $ 5,027
[1] | See Note 2 – Summary of Significant Accounting Policies – Captive Insurance Collateral.

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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