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Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Sep. 30, 2018
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income
Changes in AOCI, net of tax, during Fiscal 2018, Fiscal 2017 and Fiscal 2016 are as follows:
 
Postretirement
Benefit Plans
 
Derivative
Instruments
 
Total
AOCI - September 30, 2015
$
(9,276
)
 
$
(4,410
)
 
$
(13,686
)
Reclassifications of benefit plans actuarial losses and net prior service benefits
639

 
—

 
639

Reclassifications of net losses on IRPAs
—

 
1,568

 
1,568

Net losses on IRPAs
—

 
(16,942
)
 
(16,942
)
Benefit plans, principally actuarial losses
(3,197
)
 
—

 
(3,197
)
AOCI - September 30, 2016
$
(11,834
)
 
$
(19,784
)
 
$
(31,618
)
Reclassifications of benefit plans actuarial losses and net prior service benefits
956

 
—

 
956

Reclassifications of net losses on IRPAs
—

 
1,988

 
1,988

Benefit plans, principally actuarial gains
1,883

 
—

 
1,883

AOCI - September 30, 2017
$
(8,995
)
 
$
(17,796
)
 
$
(26,791
)
Reclassifications of benefit plans actuarial losses and net prior service benefits
872

 
—

 
872

Reclassifications of net losses on IRPAs
—

 
2,367

 
2,367

Net gains on interest rate swaps
—

 
20

 
20

Benefit plans, principally actuarial gains
3,203

 
—

 
3,203

AOCI - September 30, 2018
$
(4,920
)
 
$
(15,409
)
 
$
(20,329
)