Consolidated Statements of Cash Flows (Parenthetical)	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
5.00% Senior Secured Notes
Interest rate	5.00%	5.00%	5.00%
5.265% Senior Secured Notes
Interest rate	5.265%	5.265%	5.265%
6.750% Senior Notes
Interest rate	6.75%	6.75%	6.75%
11.5% Senior Notes
Interest rate	11.50%	11.50%	11.50%
13.75% Senior Notes due 2019
Interest rate	13.75%	13.75%	13.75%