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RETIREMENT PLANS - Additional Information (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2021 USD ($) plan | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Compensation charges | $ | $ 30.1 | $ 27.7 | $ 18.9
401(K) | Company matches 200% of associates’ initial 3% contribution |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Employer match of employee contribution (percent) | 200.00% |  |
Employee contribution of gross pay (percent) | 3.00% |  |
401(K) | Company matches 50% of associates' contribution up to 6% |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Employer match of employee contribution (percent) | 50.00% |  |
Employee contribution of gross pay (percent) | 6.00% |  |
Deferred Profit Sharing |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Employee contribution of gross pay (percent) | 4.00% |  |
Defined Benefit Pension Plan | U.S. Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Number of defined benefit plans for certain U.S. associates | plan | 2 |  |
Defined Benefit Pension Plan | International Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Number of frozen defined benefit pension plans associated with former international businesses | plan | 3 |  |
Premium payment | $ | $ 67.7 |  |

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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