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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 03, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Oct. 01, 2019
Significant Accounting Policies [Line Items] |  |  |  |  |
Percentage of annual net sales from combined second and third quarter sales | 75.00% |  |  |  |
Advertising expenses |  | $ 165.7 | $ 147.4 | $ 120.3 |
Research and development charge |  | 45.4 | 39.7 | 39.6 |
Product registration costs |  | 12.3 | 11.0 | 11.0 |
Inventory adjustments |  |  | 0.2 |  |
Adjustment to reflect inventories at net realizable values |  | 22.5 | 31.3 |  |
Interest capitalized on capital projects |  | 0.8 | 0.4 | 0.5 |
Noncash investing activities for unpaid liabilities incurred |  | 41.6 | 26.4 | 22.1 |
Unamortized capitalized software costs |  | 17.0 | 18.8 |  |
Amortization of capitalized internal use computer software |  | 4.5 | 4.0 | 2.9 |
Recognition of accumulated foreign currency translation loss |  | (1.8) | 0.9 | 1.6 |
Operating lease right-of-use-assets |  | 293.0 | 156.0 |  |
Current operating lease liabilities |  | 66.4 | 47.5 |  |
Operating lease non-current lease liabilities |  | $ 234.4 | $ 113.3 |  |
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 assets |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Operating lease right-of-use-assets |  |  |  |  | $ 129.6
Other current liabilities |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Current operating lease liabilities |  |  |  |  | 45.4
Other liabilities |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Current operating lease liabilities |  |  |  |  | $ 88.8
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 |  |  |
Sunlight Supply |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Post-closing net working capital adjustment obligation |  |  |  | 6.6 |
Minimum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Award vesting period (in years) |  | 3 years |  |  |
Expected forfeiture rate |  | 15.00% |  |  |
Intangible assets amortization period |  | 3 years |  |  |
Minimum | Officer | Performance units | 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 |  |  |
Maximum | Officer | Performance units | Project Focus |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Vesting percent of target award |  | 250.00% |  |  |
Other Nonoperating Income (Expense) |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Interest income on loans receivable |  | $ 3.8 | $ 7.6 | $ 8.6 |

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