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Financial Instruments - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Jun. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Carrying value of long-term debt, excluding leases $ 1,508,420 $ 1,498,025
Fair value of long-term debt, excluding leases $ 1,708,723 $ 1,654,886