FAIR VALUE MEASUREMENTS (Details) (USD $)	Dec. 31, 2013	Jun. 30, 2013
Assets:
Marketable equity securities	$ 7,408,000	$ 9,695,000
Recurring basis | Carrying Amount
Assets:
United States treasury bills	499,993,000
Marketable equity securities	7,408,000
Liabilities:
Debt	370,000,000
Amount of equity component of convertible notes	77,000,000
Recurring basis | Fair value
Assets:
United States treasury bills	499,993,000
Marketable equity securities	7,408,000
Total assets	507,401,000
Liabilities:
Debt	350,945,000
Total liabilities	350,945,000
Recurring basis | Level 1
Assets:
United States treasury bills	499,993,000
Marketable equity securities	7,408,000
Total assets	507,401,000
Liabilities:
Debt	350,945,000
Total liabilities	$ 350,945,000