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Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Debt Instrument [Line Items]
Total Debt	$ 512,759us-gaap_LongTermDebt	$ 381,259us-gaap_LongTermDebt
Less: Current Portion of Long-term Debt	(57,045)us-gaap_LongTermDebtCurrent	(9,500)us-gaap_LongTermDebtCurrent
Long-term Debt	455,714us-gaap_LongTermDebtNoncurrent	371,759us-gaap_LongTermDebtNoncurrent
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total Debt	330,000	189,000
Senior Notes [Member]
Debt Instrument [Line Items]
Total Debt	$ 182,759	$ 192,259

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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