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Long-Term Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Mar. 31, 2015
Debt Disclosure [Abstract]    
Bank Credit Facility $ 382,000 $ 330,000
Senior Notes 125,714 182,759
Total Debt 507,714 512,759
Less: Current Portion of Long-term Debt (8,000) (57,045)
Long-term Debt $ 499,714 $ 455,714