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Financial Instruments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Jun. 30, 2012
Debt Instrument [Line Items]
Carrying value of long-term debt, excluding leases	$ 1,740,352	$ 1,728,983
Fair value of long-term debt, excluding leases	$ 2,058,919	$ 2,005,887

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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