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Accumulated Other Comprehensive Loss
 9 Months Ended
Jun. 30, 2026
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Comprehensive Income (Loss) Note [Text Block] Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss) is as follows:

  Pension actuarial amortization,
net of income tax 		Foreign currency translation,
net of income tax		Total
(in millions)
Balance as of September 30, 2025$(14.9)$10.3 $(4.6)
Current period other comprehensive income1.1 7.8 8.9 
Balance as of June 30, 2026$(13.8)$18.1 $4.3 

For the nine months ended June 30, 2026, pension actuarial amortization included in the condensed consolidated statements of comprehensive income was $1.4 million, net of $0.3 million income tax. Refer to Note 5. Retirement Plan for further information. For the nine months ended June 30, 2026, foreign currency translation included in the condensed consolidated statements of comprehensive income was $7.8 million, net of no income tax.
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Accumulated other comprehensive income (loss) is as follows:

  Pension actuarial amortization,
net of income tax 		Foreign currency translation,
net of income tax		Total
(in millions)
Balance as of September 30, 2025$(14.9)$10.3 $(4.6)
Current period other comprehensive income1.1 7.8 8.9 
Balance as of June 30, 2026$(13.8)$18.1 $4.3