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Income Taxes - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 01, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
Prepaid expenses and income taxes |  | $ 1,962,000 |  |  | $ 1,962,000 |  |
Income taxes due included in accounts and income taxes payable |  |  |  |  |  | $ 584,000 |
Recognizes interest and penalties related to uncertain tax positions |  |  |  |  | (53,000) | 35,000 | $ 72,000
Accrued interest and penalties related to uncertain tax positions |  | $ 194,000 |  |  | $ 194,000 | $ 247,000 | $ 212,000
Reduction of corporate federal income tax rate |  | 21.00% |  | 35.00% |  |  |
Newly enacted corporate federal income tax rate |  |  | 21.00% |  |  |  |
Effective tax rate as a percentage |  |  | 5.00% |  |  |  |
Liability for unrecognized tax benefits |  |  | $ 3,000,000 | $ 3,000,000 |  |  |
Minimum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
Effective combined federal and state tax rate | 24.00% |  |  |  |  |  |
Maximum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
Effective combined federal and state tax rate | 26.00% |  |  |  |  |  |
Earliest Tax Year [Member] |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
Tax fiscal years open to examination |  |  |  |  | 2014 |  |
Latest Tax Year [Member] |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
Tax fiscal years open to examination |  |  |  |  | 2017 |  |

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- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)(b)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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