Related Party Transactions - Additional Information (Detail)	3 Months Ended
Jun. 30, 2019 USD ($) shares
Nimble Holding Company Limited
Related Party Transaction [Line Items]
Nimble's Ownership Interest in Emerson number of shares \| shares	15,243,283
Nimble's Ownership Interest Percentage	72.40%
VACL
Related Party Transaction [Line Items]
Advanced payment of rental and utility fees from related parties	$ 43,500
Due from related parties	$ 750

The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(k)(1))
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-Name Accounting Standards Codification
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-Publisher FASB
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-Topic 210
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-Section S99
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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
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-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Name:	us-gaap_DueFromRelatedPartiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant