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LONG-TERM DEBT (Tables)
12 Months Ended
Sep. 30, 2016
Debt Disclosure [Abstract]  
Schedule of maturities of long-term debt by fiscal year
Maturities of long-term debt for Spire, Laclede Gas and Alagasco for the five fiscal years subsequent to September 30, 2016 are as follows:
 
Spire
 
Laclede Gas
 
Alagasco
2017
$
250.0

 
$

 
$

2018
100.0

 
100.0

 

2019
180.0

 
50.0

 

2020
40.0

 

 
40.0

2021
55.0