FINANCING ARRANGEMENTS: (Details) (USD $)	3 Months Ended					3 Months Ended	6 Months Ended			1 Months Ended	6 Months Ended					1 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2011	Jun. 30, 2011 Senior term notes	Dec. 31, 2011 Senior term notes	Dec. 31, 2011 Private Shelf Agreement	Jun. 30, 2011 Private Shelf Agreement	Jul. 31, 2009 Convertible senior notes	Dec. 31, 2011 Convertible senior notes Y	Dec. 31, 2010 Convertible senior notes	Jun. 30, 2011 Convertible senior notes	Dec. 31, 2011 Revolving credit facility	Jun. 30, 2011 Revolving credit facility	Sep. 30, 2011 Equipment and leasehold notes payable Y	Jun. 30, 2011 Equipment and leasehold notes payable	Dec. 31, 2011 Equipment and leasehold notes payable	Jun. 30, 2011 Other notes payable	Dec. 31, 2011 Other notes payable
Total debt
Balance at the beginning of period	$ 304,015,000	$ 313,411,000	$ 439,669,000	$ 440,029,000
Repayment of long-term debt and capital lease obligations	(12,321,000)	(9,669,000)	(39,258,000)	(3,334,000)
Amortized debt discount	1,208,000	1,183,000	1,110,000	1,086,000							2,391,000	2,196,000
Other	(21,000)	(910,000)	2,624,000	1,888,000
Balance at the end of period	292,881,000	304,015,000	404,145,000	439,669,000
Long-term debt
Interest rate percentage, minimum (as a percent)						6.69%	6.69%										8.80%	4.90%	5.75%	5.75%
Interest rate percentage, maximum (as a percent)						8.50%	8.50%										9.14%	8.78%	8.00%	8.00%
Interest rate percentage										5.00%	5.00%		5.00%			4.90%
Less current portion	(28,999,000)				(32,252,000)			(22,100,000)	(22,100,000)
Long-term portion	263,882,000				281,159,000
Principal amount of long-term debt										172,500,000	172,500,000	172,500,000				20,500,000
Net carrying amount of long-term debt	292,881,000				313,411,000	133,571,000	115,714,000	115,700,000	133,600,000		158,639,000	153,956,000	156,248,000				22,273,000	17,803,000	1,319,000	725,000
Long-term debt, additional disclosures
Long-term debt conversion ratio										64.6726	64.9954
Principal amount applied to conversion ratio										1,000	1,000
Long-term debt conversion price (in dollars per share)										$ 15.46	$ 15.39
Convertible long-term debt amount allocated to equity										24,700,000
Fair value of long-term debt										147,800,000
Effective interest rate on the convertible debt (as a percent)										8.90%
Debt discount amortization period (in years)											5
Unamortized debt discount										(24,700,000)	(13,861,000)	(18,544,000)
Interest cost related to contractual interest coupon											4,313,000	4,313,000
Interest cost related to amortization of the discount	1,208,000	1,183,000	1,110,000	1,086,000							2,391,000	2,196,000
Total interest cost											6,704,000	6,509,000
Outstanding standby letters of credit														26,000,000	26,000,000
Revolving credit facility remaining borrowing capacity														$ 374,000,000	$ 374,000,000
Debt instrument term (in years)																3
Capital lease amortization rate (as a percent)																9.20%