Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	May 31, 2018	Sep. 28, 2018
First Amendment to Amended and Restated Lease
Commitments and Contingencies Disclosure [Line Items]
Lease agreement term	12 years
Lease expiration date	May 31, 2031
Lease annual rental payment	$ 1.8
Increase in annual lease rental payments rate	2.50%
Future minimum lease payments		$ 26.4
Existing Lease Agreement
Commitments and Contingencies Disclosure [Line Items]
Lease expiration date	May 31, 2019

Commitments and contingencies disclosure.

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- Definition

Lease annual rental payment.

+ References

No definition available.

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- Definition

Lease annual rental payment increase percentage.

+ References

No definition available.

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- Definition

Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

+ References

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- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
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- Definition

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
-URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697

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-Section 50
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