Schedule of Unrecognized Tax Benefits Which Would Lower Effective Tax Rate if Realized (Detail) - State and Local Jurisdiction $ in Thousands	12 Months Ended
Mar. 31, 2017 USD ($)
Income Tax Contingency [Line Items]
Unrecognized tax benefit related to state tax issues	$ 12,367
Interest receivable on unrecognized tax benefit related to state tax issues	$ 48

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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