FINANCING ARRANGEMENTS (Details) (USD $)	1 Months Ended	3 Months Ended
	Jul. 31, 2009 Y	Sep. 30, 2011	Sep. 30, 2010
Total debt
Balance at the beginning of period		$ 313,411,000	$ 440,029,000
Repayment of long-term debt and capital lease obligations		(9,669,000)	(3,334,000)
Amortized debt discount		1,183,000	1,086,000
Other		(910,000)	1,888,000
Balance at the end of period		304,015,000	439,669,000
Long-term debt
Net carrying amount of long-term debt		304,000,000
Long-term debt, additional disclosures
Interest cost related to amortization of the discount		1,183,000	1,086,000
Convertible senior notes
Total debt
Amortized debt discount		1,183,000	1,086,000
Long-term debt
Principal amount of long-term debt	172,500,000	172,500,000	172,500,000
Interest rate percentage (as a percent)	5.00%	5.00%	5.00%
Net carrying amount of long-term debt		157,431,000	152,847,000
Long-term debt, additional disclosures
Long-term debt conversion ratio	64.6726	64.9168
Principal amount applied to conversion ratio	1,000	1,000
Long-term debt conversion price (in dollars per share)	$ 15.46	$ 15.40
Convertible long-term debt amount allocated to equity	24,700,000
Fair value of long-term debt	147,800,000
Debt discount amortization period (in years)	5
Effective interest rate on the convertible debt (as a percent)	8.90%
Unamortized debt discount	(24,700,000)	(15,069,000)	(19,653,000)
Interest cost related to contractual interest coupon		2,156,000	2,156,000
Interest cost related to amortization of the discount		1,183,000	1,086,000
Total interest cost		3,339,000	3,242,000
Agreement to refinance existing capital leases
Long-term debt
Principal amount of long-term debt		$ 20,500,000
Debt instrument term (in years)		3
Interest rate percentage (as a percent)		4.90%
Capital lease amortization rate (as a percent)		9.20%