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FINANCING ARRANGEMENTS (Details) (USD $) | 3 Months Ended | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended |  |  | 1 Months Ended | 12 Months Ended
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Jun. 30, 2013 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Senior term notes outstanding under Private Shelf Agreement | Jun. 30, 2012 Senior term notes outstanding under Private Shelf Agreement | Jun. 30, 2013 Private Shelf Agreement | Jul. 31, 2009 Convertible senior notes | Jun. 30, 2013 Convertible senior notes | Jun. 30, 2012 Convertible senior notes | Jun. 11, 2013 Revolving credit facility | Jun. 30, 2013 Revolving credit facility | Jun. 30, 2012 Revolving credit facility | Sep. 30, 2011 Equipment and leasehold notes payable | Jun. 30, 2013 Equipment and leasehold notes payable | Jun. 30, 2012 Equipment and leasehold notes payable | Jun. 30, 2013 Other notes payable | Jun. 30, 2012 Other notes payable
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage, minimum |  |  |  | 6.69% | 6.69% |  |  |  |  |  |  |  |  | 4.90% | 4.90% | 5.75% | 5.75%
Interest rate percentage, maximum |  |  |  | 8.50% | 8.50% |  |  |  |  |  |  |  |  | 8.75% | 8.75% | 8.00% | 8.00%
Interest rate percentage |  |  |  |  |  |  | 5.00% | 5.00% | 5.00% |  |  |  | 4.90% |  |  |  |
Net carrying amount of long-term debt | $ 174,770,000 | $ 174,770,000 | $ 287,674,000 |  | $ 111,429,000 |  |  | $ 166,454,000 | $ 161,134,000 |  |  |  |  | $ 8,316,000 | $ 14,780,000 |  | $ 331,000
Less current portion | (173,515,000) | (173,515,000) | (28,937,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term portion | 1,255,000 | 1,255,000 | 258,737,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate maturities of long-term debt, including capital lease obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital lease obligations | 8,300,000 | 8,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fiscal year, 2014 | 173,515,000 | 173,515,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fiscal year, 2015 | 1,253,000 | 1,253,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fiscal year, 2016 | 2,000 | 2,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment of debt |  |  |  |  |  | 89,300,000 |  |  |  |  |  |  |  |  |  |  |
Make-whole payments related to repayment of long-term debt | 6,700,000 | 10,600,000 |  |  |  | 10,600,000 |  |  |  |  |  |  |  |  |  |  |
Long-term debt, additional disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of long-term debt |  |  |  |  |  |  | 172,500,000 | 172,500,000 | 172,500,000 |  |  |  |  | 8,300,000 |  |  |
Long-term debt conversion ratio |  |  |  |  |  |  |  | 0.0654357 |  |  |  |  |  |  |  |  |
Long-term debt conversion price (in dollars per share) |  |  |  |  |  |  |  | $ 15.28 |  |  |  |  |  |  |  |  |
Convertible long-term debt amount allocated to equity |  |  |  |  |  |  | 24,700,000 |  |  |  |  |  |  |  |  |  |
Unamortized debt discount |  |  |  |  |  |  | (24,700,000) | (6,046,000) | (11,366,000) |  |  |  |  |  |  |  |
Debt discount amortization period |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Effective interest rate on the convertible debt (as a percent) |  |  |  |  |  |  | 8.90% |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Interest expense related to contractual interest coupon |  |  |  |  |  |  |  | 8,625,000 | 8,625,000 |  |  |  |  |  |  |  |
Interest cost related to amortization of the discount |  |  |  |  |  |  |  | 5,320,000 | 4,886,000 |  |  |  |  |  |  |  |
Total interest cost |  |  |  |  |  |  |  | 13,945,000 | 13,511,000 |  |  |  |  |  |  |  |
Revolving credit facility maximum borrowing capacity |  |  |  |  |  |  |  |  |  | 400,000,000 |  |  |  |  |  |  |
Variable interest rate basis |  |  |  |  |  |  |  |  |  | LIBOR |  |  |  |  |  |  |
Maximum borrowing capacity, optional expansion |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |
Threshold default of other debt to trigger event of default |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |
Revolving credit facility outstanding amount |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |
Outstanding standby letters of credit |  |  |  |  |  |  |  |  |  |  | 2,200,000 | 26,100,000 |  |  |  |  |
Revolving credit facility remaining borrowing capacity |  |  |  |  |  |  |  |  |  |  | 397,800,000 | 373,900,000 |  |  |  |  |
Restricted cash used to collateralize insurance reserves | 27,500,000 | 27,500,000 | 4,500,000 |  |  |  |  |  |  |  | 24,500,000 |  |  |  |  |  |
Capital lease amortization rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 9.20% |  |  |  |
Gain (loss) recorded on refinancing of capital leases |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |

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