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Shareholders' Equity - AOCI Reclassifications (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Accumulated other comprehensive income (loss) components which were reclassified to the Consolidated Statement of Income        
General and administrative $ (33,811) $ (34,995) $ (65,885) $ (67,731)
Reclassification out of AOCI | Amortization of net actuarial loss        
Accumulated other comprehensive income (loss) components which were reclassified to the Consolidated Statement of Income        
General and administrative (493) (309) (986) (618)
Income tax provision 180 112 360 225
Total reclassifications for the period $ (313) $ (197) $ (626) $ (393)