Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Name:	us-gaap_IncomeTaxContingencyLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Taxation - PRC Value Added Tax (Details) - PRC	3 Months Ended	9 Months Ended	12 Months Ended
Taxation - PRC Value Added Tax (Details) - PRC	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2019
Online English language education services
Income taxes
VAT tax (as a percent)			6.00%
Learning materials
Income taxes
VAT tax (as a percent)	10.00%	9.00%
Textbooks
Income taxes
VAT tax (as a percent)			13.00%