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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2018 | Apr. 01, 2017 | Mar. 31, 2017
Income Tax Contingency [Line Items] |  |  |  |  |
U.S. statutory federal income tax rate, percent | 21.00% | 35.00% | 31.60% |  |
Cumulative effect adjustment related to unrecognized excess tax benefits on share based compensation |  |  |  | $ 58,700,000 |
Valuation allowance | $ 29,049,000 |  | $ 29,049,000 |  | $ 17,728,000
Impact on effective tax rate | 49,500,000 |  | 49,500,000 |  |
Accrued interest or penalties associated with uncertain tax positions | 0 |  | 0 |  | $ 0
Provisional income tax expense |  |  | 5,300,000 |  |
United States [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating loss carryforwards | 697,800,000 |  | $ 697,800,000 |  |
Operating loss carryforwards expiration beginning year |  |  | 2021 |  |
United States [Member] | Earliest Tax Year [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax years subject to examination |  |  | 2015 |  |
United States [Member] | Latest Tax Year [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax years subject to examination |  |  | 2017 |  |
United States [Member] | Research [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax credit carryforward amount | 135,800,000 |  | $ 135,800,000 |  |
United States [Member] | Research [Member] | Earliest Tax Year [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax credit carryforwards expiration beginning year |  |  | 2026 |  |
State [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating loss carryforwards | 637,800,000 |  | $ 637,800,000 |  |
Operating loss carryforwards expiration beginning year |  |  | 2019 |  |
State [Member] | Earliest Tax Year [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax years subject to examination |  |  | 2014 |  |
State [Member] | Latest Tax Year [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax years subject to examination |  |  | 2017 |  |
State [Member] | Research [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax credit carryforward amount | $ 130,000,000 |  | $ 130,000,000 |  |
State [Member] | Research [Member] | Earliest Tax Year [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax credit carryforwards expiration beginning year |  |  | 2019 |  |
Foreign [Member] | Earliest Tax Year [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax years subject to examination |  |  | 2014 |  |
Foreign [Member] | Latest Tax Year [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax years subject to examination |  |  | 2017 |  |

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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=84230637&loc=d3e32537-109319 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + 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=84230637&loc=d3e32718-109319 + Details
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