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Amount Outstanding of Tranches - Two Thousand Seven Note Purchase Agreement (Detail) - 2007 Note Purchase Agreement [Member] - Series 2007A Tranche D [Member]
$ in Millions
12 Months Ended
Mar. 31, 2018
USD ($)
Debt Instrument [Line Items]  
Principal $ 36.5
Maturity Date Oct. 02, 2019
Interest Rate 6.48%