Income Taxes (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Reconciliation of the Company's provision (benefit) for income taxes to the U.S. federal statutory rate
Provision for income taxes at statutory rate	$ (84,566)	$ 54,917	$ 55,169
State taxes, net of tax benefit	(7,002)	2,221	3,228
Nondeductible items	(642)	1,114	(48)
Deemed foreign dividends	4,289	7,091	5,358
Other	2,357	1,176	(2,670)
Impact of foreign operations	2,125	(5,707)	(4,910)
Foreign tax credit	(4,205)	(5,329)	(3,312)
Tax contingencies	772	(677)
Actual (benefit) provision for income taxes	$ 86,872	$ (54,806)	$ (52,815)
Reconciliation of the Company's provision (benefit) for income taxes to the U.S. federal statutory rate
Provision for income taxes at statutory rate (as a percent)	35.00%	35.00%	35.00%
State taxes, net of tax benefit (as a percent)	2.90%	1.42%	2.05%
Deemed foreign dividends (as a percent)	(1.78%)	4.52%	3.40%
Nondeductible items (as a percent)	0.27%	0.71%	(0.03%)
Other (as a percent)	(0.98%)	0.75%	(1.70%)
Foreign income not taxed at the Federal rate (as a percent)	(0.88%)	(3.64%)	(3.11%)
Foreign tax credit (as a percent)	1.74%	(3.40%)	(2.10%)
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent	(0.32%)	(0.43%)
Actual provision for income taxes (as a percent)	35.95%	34.93%	33.51%