FINANCING ARRANGEMENTS: (Details) (USD $)	3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013	Jul. 31, 2009
Long-term debt
Net carrying amount of long-term debt	$ 174,467,000		$ 174,770,000
Less current portion	(174,452,000)		(173,515,000)
Long-term portion	15,000		1,255,000
Convertible senior notes
Long-term debt
Interest rate percentage	5.00%			5.00%
Net carrying amount of long-term debt	167,857,000		166,454,000
Long-term debt, additional disclosures
Principal amount of long-term debt				172,500,000
Long-term debt conversion ratio	0.0655131
Long-term debt conversion price (in dollars per share)	$ 15.26
Interest expense related to contractual interest coupon	2,200,000	2,200,000
Interest cost related to amortization of the discount	1,400,000	1,300,000
Revolving credit facility
Long-term debt, additional disclosures
Revolving credit facility outstanding amount	0		0
Outstanding standby letters of credit	2,200,000		2,200,000
Revolving credit facility remaining borrowing capacity	397,800,000		397,800,000
Equipment and leasehold notes payable
Long-term debt
Interest rate percentage, minimum	4.90%
Interest rate percentage, maximum	8.75%
Net carrying amount of long-term debt	$ 6,610,000		$ 8,316,000