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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($) shares in Millions, $ in Millions |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 13, 2023 | Jul. 01, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Oct. 27, 2023
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Percentage of annual net sales from combined second and third quarter sales |  | 75.00% |  |  |  |
Number of restricted shares issued (in shares) | 0.4 |  |  |  |  |
Deferred advertising costs |  |  | $ 20.0 |  |  |
Advertising expenses |  |  | 123.7 | $ 120.3 | $ 165.7 |
Research and development charge |  |  | 35.7 | 45.3 | 45.4 |
Product registration costs |  |  | 12.4 | 13.0 | 12.3 |
Interest capitalized on capital projects |  |  | 2.1 | 2.2 | 0.8 |
Noncash investing activities for unpaid liabilities incurred |  |  | 32.1 | 33.3 | 41.6 |
Outstanding payment obligations |  |  | 18.3 | 8.6 |  |
Supplier finance payment |  |  | 185.3 |  |  |
Recognition of accumulated foreign currency translation loss |  |  | 1.3 | 1.3 | (1.8) |
Operating lease right-of-use assets |  |  | 262.6 | 288.9 |  |
Current lease liabilities |  |  | 76.4 | 76.2 |  |
Non-current operating lease liabilities |  |  | $ 220.1 | $ 223.2 |  |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] |  |  | Other Liabilities, Current | Other Liabilities, Current |  |
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] |  |  | Other Liabilities, Noncurrent | Other Liabilities, Noncurrent |  |
Other investing, net |  |  | $ (12.4) | $ 29.3 | $ (8.7) |
Payments for (Proceeds from) Loans Receivable |  |  | $ 37.0 |  |  |
Supplier Finance Program, Obligation, Statement of Financial Position [Extensible Enumeration] |  |  | Accounts Payable, Current | Accounts Payable, Current |  |
Subsequent Event |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Accounts Receivable, Held-for-Sale |  |  |  |  |  | $ 600.0
Standby Letters of Credit | Subsequent Event |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 70.0
Officer | Options | Project Focus |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Expiration period (in years) |  |  | 10 years |  |  |
Director |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Award vesting period (in years) |  |  | 1 year |  |  |
Minimum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Award vesting period (in years) |  |  | 3 years |  |  |
Expected forfeiture rate |  |  | 15.00% |  |  |
Intangible assets amortization period |  |  | 3 years |  |  |
Payment timing, period |  |  | 30 days |  |  |
Minimum | Software |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Intangible assets amortization period |  |  | 3 years |  |  |
Minimum | Officer | Performance Shares [Member] | Project Focus |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Vesting percent of target award |  |  | 50.00% |  |  |
Maximum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Award vesting period (in years) |  |  | 5 years |  |  |
Intangible assets amortization period |  |  | 25 years |  |  |
Payment timing, period |  |  | 60 days |  |  |
Maximum | Software |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Intangible assets amortization period |  |  | 8 years |  |  |
Maximum | Officer | Performance Shares [Member] | Project Focus |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Vesting percent of target award |  |  | 250.00% |  |  |

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