FAIR VALUE MEASUREMENTS (Details) (USD $)	Jun. 30, 2014	Jun. 30, 2013
Assets:
Marketable equity securities	$ 9,608,000	$ 9,695,000
Recurring basis | Carrying Amount
Assets:
United States treasury bills	499,992,000
Marketable equity securities	9,608,000
Liabilities:
Debt	388,860,000
Amount of equity component of convertible notes	77,000,000
Recurring basis | Fair value
Assets:
United States treasury bills	499,992,000
Marketable equity securities	9,608,000
Total assets	509,600,000
Liabilities:
Debt	394,050,000
Total liabilities	394,050,000
Recurring basis | Level 1
Assets:
United States treasury bills	499,992,000
Marketable equity securities	9,608,000
Total assets	509,600,000
Liabilities:
Debt	394,050,000
Total liabilities	$ 394,050,000