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Borrowing Arrangements (Narrative) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 28, 2024 | Jun. 30, 2024 | Dec. 31, 2021 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Sep. 30, 2023 | May 28, 2021
Long-term Debt, Gross |  | $ 452.3 |  | $ 452.3 |  |  | $ 451.3 |
Outstanding letter of credit accrued fees and expenses |  | 0.2 |  | 0.2 |  |  |  |
Future maturities of outstanding borrowings |  |  |  |  |  |  |  |
Payments of debt issuance costs |  |  |  | 0.9 |  |  |  |
Payments of financing costs |  |  |  | 0.9 | $ 0.0 |  |  |
Outstanding letters of credit |  | 12.2 |  | 12.2 |  |  |  |
Domestic Line of Credit [Member] |  |  |  |  |  |  |  |
Revolving credit facility amount |  | $ (175.0) |  | (175.0) |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.10% |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.375% |  |  |  |  |  |
Future maturities of outstanding borrowings |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 175.0 |  | 175.0 |  |  |  |
Potential increase size of the credit facility by an additional amount |  |  |  | $ 150.0 |  |  |  |
Debt Instrument, Threshold for Unused Commitment Fee, Percentage of Aggregate Revolving Commitments | 50.00% |  |  |  |  |  |  |
Line of Credit Facility, Borrowing Base, Percentage of Eligible Accounts Receivable |  | 85.00% |  | 85.00% |  |  |  |
Line of Credit Facility, Borrowing Base, Percentage of Eligible Inventory |  | 70.00% |  | 70.00% |  |  |  |
Line of Credit Facility, Borrowing Base, Percentage of Net Orderly Liquidation Value of Eligible Inventory |  | 85.00% |  | 85.00% |  |  |  |
Line of Credit Facility, Covenant, Percent of Loan Cap |  | 10.00% |  | 10.00% |  |  |  |
Unsecured Debt [Member] |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  | $ 450.0
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 4.00%
Future maturities of outstanding borrowings |  |  |  |  |  |  |  |
Payments of debt issuance costs |  |  | $ 5.5 |  |  |  |  |
Financial Liabilities Fair Value Disclosure |  | $ 411.3 |  | $ 411.3 |  |  |  |
Debt Instrument, Redemption Price Upon Change In Control, Percentage |  |  |  | 101.00% |  |  |  |
Swing Line Loans [Member] |  |  |  |  |  |  |  |
Revolving credit facility amount |  | (25.0) |  | $ (25.0) |  |  |  |
Future maturities of outstanding borrowings |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 25.0 |  | 25.0 |  |  |  |
Letters Of Credit Outstanding [Member] |  |  |  |  |  |  |  |
Revolving credit facility amount |  | (60.0) |  | (60.0) |  |  |  |
Future maturities of outstanding borrowings |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 60.0 |  | 60.0 |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |
Excess availability reduced by outstanding borrowings, outstanding letters of credit and accrued fees and expenses |  | 162.6 |  | 162.6 |  |  |  |
Future maturities of outstanding borrowings |  |  |  |  |  |  |  |
Aggregate commitments availability |  |  |  | 17.5 |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 162.6 |  | $ 162.6 |  |  |  |
Revolving Credit Facility, ABL Waiver, Through February 2024 |  |  |  |  |  |  |  |
Excess availability reduced by outstanding borrowings, outstanding letters of credit and accrued fees and expenses |  |  |  |  |  | $ 50.0 |  |
Future maturities of outstanding borrowings |  |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  | $ 50.0 |  |
Minimum [Member] | Domestic Line of Credit [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.25% |  |  |  |  |  |  |
Maximum [Member] | Domestic Line of Credit [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.375% |  |  |  |  |  |
Base Rate [Member] | Domestic Line of Credit [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End |  | 0.50% |  | 0.50% |  |  |  |
Future maturities of outstanding borrowings |  |  |  |  |  |  |  |
Debt Instrument, Threshold for Variable Rate, Percentage of Aggregate Revolving Commitments | 50.00% |  |  |  |  |  |  |
Base Rate [Member] | Minimum [Member] | Domestic Line of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.50% |  |  |  |  |  |  |
Base Rate [Member] | Maximum [Member] | Domestic Line of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.75% |  |  |  |  |  |  |
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Domestic Line of Credit [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End |  | 1.50% |  | 1.50% |  |  |  |
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum [Member] | Domestic Line of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.50% |  |  |  |  |  |  |
Future maturities of outstanding borrowings |  |  |  |  |  |  |  |
Debt Instrument, Decrease to Basis Spread on Variable Rate | 0.50% |  |  |  |  |  |  |
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum [Member] | Domestic Line of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.75% |  |  |  |  |  |  |

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