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Credit Agreement - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 17, 2018 | Sep. 28, 2017 | Apr. 28, 2018 | Jan. 31, 2018 | Nov. 30, 2017 | Nov. 29, 2017 | Sep. 27, 2017 | Feb. 28, 2017
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  | $ 15,000,000 |  |  |  |  | $ 10,000,000 |
Initial upfront payment |  | $ 14,600,000 | $ 400,000 |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Commitment fee rate |  |  | 0.25% |  |  |  |  |
Credit facility, borrowing amount |  |  | $ 0 |  |  |  |  |
Revolving Credit Facility [Member] | LIBOR [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Interest rate |  |  | 1.00% |  |  |  |  |
Revolving Credit Facility [Member] | Federal Funds Effective Swap Rate [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Interest rate |  |  | 0.50% |  |  |  |  |
Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Percentage added to variable rate |  |  | 0.00% |  |  |  |  |
Revolving Credit Facility [Member] | Minimum [Member] | LIBOR [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Interest rate |  |  | 1.00% |  |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Percentage added to variable rate |  |  | 0.50% |  |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] | LIBOR [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Interest rate |  |  | 1.50% |  |  |  |  |
Second Amendment [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  | $ 10,000,000 |  |  |
Revolving credit facility termination and maturity date |  |  |  | Nov. 30, 2022 |  |  |  |
Third Amendment [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Percentage of total assets to qualify as subsidiary | 5.00% |  |  |  |  |  |  |
Percentage of revenues to qualify as subsidiary | 5.00% |  |  |  |  |  |  |
Percentage of assets and revenues to qualify as subsidiary | 10.00% |  |  |  |  |  |  |
Bank of America, N.A. [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | $ 10,000,000
Bank of America, N.A. [Member] | Term Loan [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Principal amount of debt |  |  |  |  | $ 15,000,000 |  |  | $ 9,200,000
Bank of America, N.A. [Member] | Second Amendment [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  |  | $ 15,000,000 |  |
Revolving loan outstanding |  |  |  |  |  | $ 14,600,000 |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 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(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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