Quarterly Financial Data (unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Quarterly Financial Data (unaudited)
Net revenue	$ 190,107	$ 175,621	$ 129,632	$ 137,427	$ 178,283	$ 160,657	$ 113,204	$ 135,820	$ 632,787	$ 587,964	$ 584,566
Gross profit	56,702	52,358	31,565	34,442	49,039	43,988	21,077	31,829	175,067	145,933	158,145
Net income (loss)	$ (4,906)	$ (13,036)	$ (20,558)	$ (23,748)	$ (46,732)	$ (6,348)	$ (156,154)	$ (20,687)	$ (62,248)	$ (229,921)	$ (49,482)
Basic and diluted earnings (loss) per share	$ (0.08)	$ (0.21)	$ (0.34)	$ (0.39)	$ (0.77)	$ (0.10)	$ (2.58)	$ (0.34)	$ (1.02)	$ (3.80)	$ (0.83)