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Borrowings - Additional Information (Detail) (USD $)	Sep. 30, 2014	Mar. 31, 2014
Line of Credit Facility [Line Items]
Letters of credit issued percentage of cash collateralized basis	100.00%
Outstanding letters of credit	$ 0
Long-term borrowings	$ 0	$ 0

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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