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DEBT (Summary of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Jan. 31, 2012
Debt Instrument [Line Items]
Long-term debt	$ 1,742,122	$ 1,263,232
Senior Notes [Member] \| 6.5% Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt	657,122	658,232
Stated interest rate	6.50%	6.50%	6.50%
Revolving Credit Facility [Member] \| 2011 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt	$ 1,085,000	$ 605,000

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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