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Amount Outstanding of Tranches - Two Thousand Seven Note Purchase Agreement (Detail) (2007 Note Purchase Agreement [Member], USD $)
In Millions, unless otherwise specified
9 Months Ended
Dec. 31, 2013
Series 2007A Tranche A [Member]
 
Debt Instrument [Line Items]  
Principal $ 9.5
Maturity Date Oct. 02, 2014
Interest Rate 6.08%
Series 2007A Tranche B [Member]
 
Debt Instrument [Line Items]  
Principal 8.0
Maturity Date Oct. 02, 2016
Interest Rate 6.27%
Series 2007A Tranche C [Member]
 
Debt Instrument [Line Items]  
Principal 24.0
Maturity Date Oct. 02, 2017
Interest Rate 6.36%
Series 2007A Tranche D [Member]
 
Debt Instrument [Line Items]  
Principal $ 36.5
Maturity Date Oct. 02, 2019
Interest Rate 6.48%