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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016
Income Tax Contingency [Line Items] |  |
Unrealized excess tax benefits associated with share based compensation | $ 58,700,000 |
Realized excess tax benefits | 0 |
Valuation allowance | 17,728,000 | $ 17,089,000
Impact on effective tax rate | 40,200,000 |
Accrued interest or penalties associated with uncertain tax positions | 0 | $ 0
Tax Credit Carryforward Alternative Minimum Tax [Member] |  |
Income Tax Contingency [Line Items] |  |
Tax credit carryforward amount | 400,000 |
Tax Credit Carryforward Foreign [Member] |  |
Income Tax Contingency [Line Items] |  |
Tax credit carryforward amount | $ 1,300,000 |
Tax credit carryforwards expiration beginning date | Apr. 01, 2020 |
United States [Member] |  |
Income Tax Contingency [Line Items] |  |
Operating loss carryforwards | $ 673,600,000 |
Operating loss carryforwards expiration beginning date | Apr. 01, 2019 |
Tax years subject to examination | 2014 |
United States [Member] | Research [Member] |  |
Income Tax Contingency [Line Items] |  |
Tax credit carryforward amount | $ 109,600,000 |
United States [Member] | Research [Member] | Minimum [Member] |  |
Income Tax Contingency [Line Items] |  |
Tax credit carryforwards expiration beginning date | Apr. 01, 2025 |
State [Member] |  |
Income Tax Contingency [Line Items] |  |
Operating loss carryforwards | $ 556,000,000 |
Operating loss carryforwards expiration beginning date | Apr. 04, 2015 |
Tax years subject to examination | 2013 |
State [Member] | Research [Member] |  |
Income Tax Contingency [Line Items] |  |
Tax credit carryforward amount | $ 113,800,000 |
State [Member] | Research [Member] | Minimum [Member] |  |
Income Tax Contingency [Line Items] |  |
Tax credit carryforwards expiration beginning date | Apr. 01, 2017 |
Foreign [Member] |  |
Income Tax Contingency [Line Items] |  |
Tax years subject to examination | 2013 |

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- Definition Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65880886&loc=d3e23524-113945 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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