FINANCING ARRANGEMENTS: (Details) (USD $)	3 Months Ended							9 Months Ended	12 Months Ended			1 Months Ended	9 Months Ended					1 Months Ended	9 Months Ended	12 Months Ended		9 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2011	Mar. 31, 2012 Senior term notes	Jun. 30, 2011 Senior term notes	Mar. 31, 2012 Private Shelf Agreement	Jun. 30, 2011 Private Shelf Agreement	Jul. 31, 2009 Convertible senior notes	Mar. 31, 2012 Convertible senior notes Y	Mar. 31, 2011 Convertible senior notes	Jun. 30, 2011 Convertible senior notes	Mar. 31, 2012 Revolving credit facility	Jun. 30, 2011 Revolving credit facility	Sep. 30, 2011 Equipment and leasehold notes payable Y	Mar. 31, 2012 Equipment and leasehold notes payable	Jun. 30, 2011 Equipment and leasehold notes payable	Sep. 29, 2011 Equipment and leasehold notes payable	Mar. 31, 2012 Other notes payable	Jun. 30, 2011 Other notes payable
Total debt
Balance at the beginning of period	$ 292,881,000	$ 304,015,000	$ 313,411,000	$ 404,145,000	$ 439,669,000	$ 440,029,000
Repayment of long-term debt and capital lease obligations	(1,811,000)	(12,321,000)	(9,669,000)	(2,937,000)	(39,258,000)	(3,334,000)
Amortized debt discount	1,234,000	1,208,000	1,183,000	1,134,000	1,110,000	1,086,000							3,625,000	3,329,000
Other	3,000	(21,000)	(910,000)	1,949,000	2,624,000	1,888,000
Balance at the end of period	292,307,000	292,881,000	304,015,000	404,291,000	404,145,000	439,669,000
Long-term debt
Interest rate percentage, minimum								6.69%	6.69%										4.90%	8.80%		5.75%	5.75%
Interest rate percentage, maximum								8.50%	8.50%										8.78%	9.14%		8.00%	8.00%
Interest rate percentage												5.00%	5.00%		5.00%						4.90%
Net carrying amount of long-term debt	292,307,000						313,411,000	115,714,000	133,571,000	115,700,000	133,600,000		159,873,000		156,248,000				16,312,000	22,273,000		408,000	1,319,000
Less current portion	(28,877,000)						(32,252,000)			(22,100,000)	(22,100,000)
Long-term portion	263,430,000						281,159,000
Principal amount of long-term debt												172,500,000	172,500,000		172,500,000						20,500,000
Long-term debt, additional disclosures
Long-term debt conversion ratio												64.6726	65.0715
Principal amount applied to conversion ratio												1,000	1,000
Long-term debt conversion price (in dollars per share)												$ 15.46	$ 15.37
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)	(12,627,000)		(16,252,000)
Interest cost related to contractual interest coupon													6,469,000	6,469,000
Interest cost related to amortization of the discount	1,234,000	1,208,000	1,183,000	1,134,000	1,110,000	1,086,000							3,625,000	3,329,000
Total interest cost													10,094,000	9,798,000
Outstanding standby letters of credit																26,100,000	26,000,000
Revolving credit facility remaining borrowing capacity																$ 373,900,000	$ 374,000,000
Debt instrument term (in years)																		3
Capital lease amortization rate (as a percent)																		9.20%