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Financial Instruments - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Jun. 30, 2013
Disclosure Financial Instruments And Fair Value Measurement Additional Information [Abstract]    
Carrying value of long-term debt, excluding leases $ 1,509,062 $ 1,498,025
Fair value of long-term debt, excluding leases $ 1,677,270 $ 1,654,886