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EMPLOYEE BENEFIT PLANS - Plan assets and benefit obligation of the defined benefit plans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Change in plan assets: |  |  |
Fair value of plan assets at beginning of fiscal year | $ 147,145 |  |
Fair value of plan assets at end of fiscal year | 160,523 | $ 147,145 |
Pension Plan |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of fiscal year | 183,003 | 177,797 |
Interest cost | 2,816 | 4,267 | $ 5,778
Benefits paid | (10,743) | (10,747) |
Actuarial (gain) loss | (4,571) | 11,686 |
Benefit obligation at end of fiscal year | 170,505 | 183,003 | 177,797
Change in plan assets: |  |  |
Fair value of plan assets at beginning of fiscal year | 147,145 | 145,610 |
Actual return on plan assets | 23,199 | 4,261 |
Company contributions | 922 | 8,021 |
Benefits paid | (10,743) | (10,747) |
Fair value of plan assets at end of fiscal year | 160,523 | 147,145 | 145,610
Projected benefit obligation in excess of plan assets | (9,982) | (35,858) |
Amounts recognized in the statement of financial position consist of: |  |  |
Accrued liabilities | 0 | 0 |
Other liabilities (long-term) | (9,982) | (35,858) |
Total Liabilities | (9,982) | (35,858) |
Net actuarial losses | 38,296 | 61,666 |
Prior service cost | 0 | 0 |
Deferred taxes | (8,042) | (12,950) |
Total Accumulated other comprehensive loss, net of tax | 30,254 | 48,716 |
Net amount recognized at September 30, | 20,272 | 12,858 |
Accumulated benefit obligations | 170,505 | 183,003 |
Information for plans with accumulated benefit obligations in excess of plan assets: |  |  |
ABO | 170,505 | 183,003 |
PBO | 170,505 | 183,003 |
Fair value of plan assets | 160,523 | 147,145 |
Supplemental Employee Retirement Plan |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of fiscal year | 16,070 | 16,180 |
Interest cost | 162 | 335 | 503
Benefits paid | (1,936) | (1,939) |
Actuarial (gain) loss | 479 | 1,494 |
Benefit obligation at end of fiscal year | 14,775 | 16,070 | 16,180
Change in plan assets: |  |  |
Fair value of plan assets at beginning of fiscal year | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Company contributions | 1,936 | 1,939 |
Benefits paid | (1,936) | (1,939) |
Fair value of plan assets at end of fiscal year | 0 | 0 | $ 0
Projected benefit obligation in excess of plan assets | (14,775) | (16,070) |
Amounts recognized in the statement of financial position consist of: |  |  |
Accrued liabilities | (1,884) | (1,891) |
Other liabilities (long-term) | (12,890) | (14,179) |
Total Liabilities | (14,774) | (16,070) |
Net actuarial losses | 7,662 | 7,700 |
Prior service cost | 0 | 0 |
Deferred taxes | (1,609) | (1,617) |
Total Accumulated other comprehensive loss, net of tax | 6,053 | 6,083 |
Net amount recognized at September 30, | (8,721) | (9,987) |
Accumulated benefit obligations | 14,775 | 16,070 |
Information for plans with accumulated benefit obligations in excess of plan assets: |  |  |
ABO | 14,775 | 16,070 |
PBO | 14,775 | 16,070 |
Fair value of plan assets | $ 0 | $ 0 |

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- Definition Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920 + Details
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- Definition Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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