SHAREHOLDER'S EQUITY - AOCI Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Selling, general and administrative	$ 54,508	$ 46,459
Loss on investment securities	42,844
Income tax (benefit) provision	1,352	(500,641)
Net of tax	(18,959)	(500,106)
Defined Benefit Pension Plan | Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Income tax (benefit) provision	(67)	(121)
Net of tax	225	340
Amortization of net actuarial loss on defined benefit pension plan | Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Selling, general and administrative	$ 292	$ 461