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Equity Reclassifications out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Pension and Other Postretirement Benefit Plans    
Amortization of prior service cost and initial obligation $ (1,717) $ (1,643)
Recognized actuarial loss (54,558) (42,577)
Total before tax (56,275) (44,220)
Tax benefit 20,102 15,999
Net of tax $ (36,173) $ (28,221)