Summary of Open Tax Years (Detail)	9 Months Ended
	Dec. 31, 2014
Minimum | States
Income Tax Examination [Line Items]
Open tax years	2009
Minimum | U.S. federal
Income Tax Examination [Line Items]
Open tax years	2009
Maximum | States
Income Tax Examination [Line Items]
Open tax years	2013
Maximum | U.S. federal
Income Tax Examination [Line Items]
Open tax years	2013