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FINANCING ARRANGEMENTS: (Details) (USD $) | 3 Months Ended |  | 3 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended |  |  |  | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Jun. 30, 2012 | Sep. 30, 2012 Senior term notes outstanding under Private Shelf Agreement | Jun. 30, 2012 Senior term notes outstanding under Private Shelf Agreement | Jul. 31, 2009 Convertible senior notes year | Sep. 30, 2012 Convertible senior notes year | Sep. 30, 2011 Convertible senior notes | Jun. 30, 2012 Convertible senior notes | Sep. 30, 2012 Revolving credit facility | Jun. 30, 2012 Revolving credit facility | Sep. 30, 2012 Equipment and leasehold notes payable | Jun. 30, 2012 Equipment and leasehold notes payable | Sep. 30, 2012 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%
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% |  |  |  |  |  |
Net carrying amount of long-term debt | $ 280,061,000 | $ 330,000,000 | $ 287,674,000 | $ 104,286,000 | $ 111,429,000 |  | $ 162,422,000 | $ 157,431,000 | $ 161,134,000 |  |  | $ 13,219,000 | $ 14,780,000 | $ 134,000 | $ 331,000
Less current portion | (28,883,000) |  | (28,937,000) | (22,100,000) | (22,100,000) |  |  |  |  |  |  |  |  |  |
Long-term portion | 251,178,000 |  | 258,737,000 |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, additional disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of long-term debt |  |  |  |  |  | 172,500,000 | 172,500,000 | 172,500,000 |  |  |  |  |  |  |
Long-term debt conversion ratio |  |  |  |  |  | 64.6726 | 65.2163 |  |  |  |  |  |  |  |
Principal amount applied to conversion ratio |  |  |  |  |  | 1,000 | 1,000 |  |  |  |  |  |  |  |
Long-term debt conversion price (in dollars per share) |  |  |  |  |  | $ 15.46 | $ 15.33 |  |  |  |  |  |  |  |
Convertible long-term debt amount allocated to equity |  |  |  |  |  | 24,700,000 |  |  |  |  |  |  |  |  |
Fair value of long-term debt |  |  |  |  |  | 147,800,000 |  |  |  |  |  |  |  |  |
Effective interest rate on the convertible debt (as a percent) |  |  |  |  |  | 8.90% |  |  |  |  |  |  |  |  |
Debt discount amortization period |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Unamortized debt discount |  |  |  |  |  | (24,700,000) | (10,078,000) | (15,069,000) |  |  |  |  |  |  |
Interest cost related to contractual interest coupon |  |  |  |  |  |  | 2,156,000 | 2,156,000 |  |  |  |  |  |  |
Interest cost related to amortization of the discount | 1,288,000 | 1,183,000 |  |  |  |  | 1,288,000 | 1,183,000 |  |  |  |  |  |  |
Total interest cost |  |  |  |  |  |  | 3,444,000 | 3,339,000 |  |  |  |  |  |  |
Outstanding standby letters of credit |  |  |  |  |  |  |  |  |  | 51,000,000 | 26,100,000 |  |  |  |
Revolving credit facility remaining borrowing capacity |  |  |  |  |  |  |  |  |  | 349,000,000 | 373,900,000 |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of period | 287,674,000 | 313,411,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt and capital lease obligations | (8,905,000) | (9,669,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized debt discount | 1,288,000 | 1,183,000 |  |  |  |  | 1,288,000 | 1,183,000 |  |  |  |  |  |  |
Other | 4,000 | (910,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the end of period | $ 280,061,000 | $ 304,015,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt and payment of capital lease obligations. + References No definition available. + Details
Name: | us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration