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Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Mar. 31, 2013
Debt Instrument [Line Items]
Total	$ 455,259	$ 489,259
Credit Facility [Member]
Debt Instrument [Line Items]
Total	263,000	297,000
Senior Notes [Member]
Debt Instrument [Line Items]
Total	$ 192,259	$ 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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