Shareholders' Equity - AOCI Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Accumulated other comprehensive income (loss) components which were reclassified to the Consolidated Statement of Income
General and administrative	$ (32,074)	$ (32,736)
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
Income tax provision	(180)	(113)
Total reclassifications for the period	$ 313	$ 196