Schedule of Unrecognized Tax Benefits Which Would Lower Effective Tax Rate if Realized (Detail) (State and Local Jurisdiction, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015
State and Local Jurisdiction
Income Tax Contingency [Line Items]
Unrecognized tax benefit related to state tax issues	$ 11,685
Interest receivable on unrecognized tax benefit related to state tax issues	$ 32