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Derivatives Derivatives (Tables)
 9 Months Ended
Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative Instruments, Gain (Loss)
Gains and losses net of reclassifications into income related to the Predecessor’s interest rate swaps were as follows:
 
 
 
Predecessor
 
Recorded to
 
April 1 Through June 8, 2016
 
October 1, 2015 Through June 8, 2016
 
Three Months Ended 
 June 30, 2015
 
Nine Months Ended 
 June 30, 2015
Realized loss
Interest expense
 
$
0.1

 
$
0.3

 
$
0.1

 
$
0.4

Unrealized gain
Other comprehensive income
 
$
0.1

 
$
0.3

 
$
—

 
$
0.1