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Financial Instruments - Estimated Fair Value of Long Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Jun. 30, 2014
Long-term Debt, Other Disclosures [Abstract]
Carrying value of long-term debt, excluding leases	$ 2,967,468us-gaap_LongTermDebt	$ 1,508,420us-gaap_LongTermDebt
Fair value of long-term debt, excluding leases	$ 3,242,988us-gaap_LongTermDebtFairValue	$ 1,708,723us-gaap_LongTermDebtFairValue

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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