Stockholders' Equity (Details) (USD $)	0 Months Ended	12 Months Ended														3 Months Ended		0 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended		12 Months Ended
	Jul. 17, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2013 Minimum	Mar. 31, 2012 Minimum	Sep. 30, 2013 Maximum	Sep. 30, 2013 Convertible Subordinated Debt	Sep. 30, 2012 Convertible Subordinated Debt	Sep. 30, 2013 Tangible Equity Units Senior Notes	Jul. 17, 2012 Tangible Equity Units Senior Notes TEUs	Mar. 31, 2012 Tangible Equity Units Senior Notes TEUs	May 31, 2010 Tangible Equity Units Senior Notes TEUs	Sep. 30, 2013 TEU Senior Amortizing Notes Maturing August 2013 [Member] Senior Notes	Sep. 30, 2012 TEU Senior Amortizing Notes Maturing August 2013 [Member] Senior Notes	Mar. 31, 2012 7 1/2% Mandatory Convertible Subordinated Notes [Member] Convertible Subordinated Debt	Sep. 30, 2013 7 1/2% Mandatory Convertible Subordinated Notes [Member] Convertible Subordinated Debt	Jul. 17, 2012 Common Stock	Sep. 30, 2013 Common Stock	Sep. 30, 2012 Common Stock	Mar. 31, 2013 Common Stock	Mar. 31, 2012 Common Stock	Sep. 30, 2013 Common Stock	Sep. 30, 2012 Common Stock	Sep. 30, 2012 Pre-adjustment shares [Member]	Sep. 30, 2013 Post-adjustment Shares [Member]
Class of Stock [Line Items]
Authorized number of shares		63,000,000	63,000,000																						100,000,000	63,000,000
Shares of common stock exchanged for the 2010 TEUs																			156,975	2,800,000			566,000	4,969,000
Tangible Equity Units (TEUs) issued during period (units)											4,600,000	2,800,000	3,000,000
Percentage of original issuance of 2010 TEUs that were exchanged						94.00%
Amortizing notes outstanding														$ 0	$ 316,000
Number of common stock exchanged for debt (shares)																					408,790	2,200,000	400,000
Value of convertible debt exchanged for common stock																48,100,000
Long-term debt								0	9,402,000								9,400,000
Number of shares in underwritten public offering (shares)																		4,400,000					0	4,400,000
Proceeds from issuance of TEU prepaid stock purchase contracts	171,400,000
Prepaid stock purchase contract settlement factor					1.40746		1.72414
Initial fair value of prepaid stock purchase contracts										88,400,000
Number of shares surrendered by emloyees (shares)		6,147	9,156	10,440
Aggregate value of stock surrendered		$ 121,000	$ 126,000	$ 170,000
382 Ownership Limitation		4.95%