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Fair Value Measurements (Tables)
12 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Carrying Value and Estimated Fair Value of Long-term Debt, Including Current Maturities

The carrying value and estimated fair value of the Company's long-term debt, including current maturities, were as follows (in millions):

 

 

September 30, 2021

 

 

September 30, 2020

 

 

Carrying

 

 

Fair

 

 

Carrying

 

 

Fair

 

 

Value

 

 

Value

 

 

Value

 

 

Value

 

Long-term debt, including current maturities(1)

$

670.3

 

 

$

676.8

 

 

$

743.3

 

 

$

768.7

 

 

(1)

Current and prior period long-term debts' carrying and fair values exclude net debt issuance costs.