Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Quarterly Financial Information Disclosure [Abstract]
Total revenue	$ 632,852	$ 429,438	$ 299,359	$ 265,764	$ 545,905	$ 354,671	$ 270,021	$ 293,170	$ 1,627,413	$ 1,463,767	$ 1,287,577
Gross profit	107,205	76,108	53,913	35,218	87,813	68,804	52,172	54,670	272,444	263,459	214,130
Operating (loss) income	36,945	17,696	6,436	(9,490)	23,452	15,088	5,617	11,532	51,587	55,689	27,261
Net (loss) from continuing operations	$ 354,524	$ 12,221	$ (2,060)	$ (18,086)	$ 60,288	$ (13,193)	$ (8,224)	$ (3,948)	$ 346,599	$ 34,923	$ (32,164)
Basic EPS from continuing operations (in dollars per share)	$ 11.42	$ 0.46	$ (0.08)	$ (0.68)	$ 2.28	$ (0.50)	$ (0.32)	$ (0.16)	$ 12.54	$ 1.35	$ (1.30)
Diluted EPS from continuing operations (in dollars per share)	$ 11.16	$ 0.38	$ (0.08)	$ (0.68)	$ 1.90	$ (0.50)	$ (0.32)	$ (0.16)	$ 10.91	$ 1.10	$ (1.30)
Inventory impairments and option contract abandonments	$ 2,860	$ 249	$ 0	$ 0	$ 5,386	$ 2,010	$ 880	$ 31	$ 3,109	$ 8,307	$ 2,633
Loss on extinguishment of debt	$ (80)	$ 0	$ 0	$ 0	$ 0	$ (19,764)	$ (153)	$ 0	(80)	$ (19,917)	$ (4,636)
Valuation Allowances and Reserves, Adjustments									$ 335,200