FAIR VALUE MEASUREMENTS (Details) (USD $)	Mar. 31, 2014	Jun. 30, 2013
Assets:
Marketable equity securities	$ 7,280,000	$ 9,695,000
Recurring basis | Carrying Amount
Assets:
United States treasury bills	499,986,000
Marketable equity securities	7,280,000
Liabilities:
Debt	386,401,000
Amount of equity component of convertible notes	77,000,000
Recurring basis | Fair value
Assets:
United States treasury bills	499,986,000
Marketable equity securities	7,280,000
Total assets	507,266,000
Liabilities:
Debt	384,800,000
Total liabilities	384,800,000
Recurring basis | Level 1
Assets:
United States treasury bills	499,986,000
Marketable equity securities	7,280,000
Total assets	507,266,000
Liabilities:
Debt	384,800,000
Total liabilities	$ 384,800,000