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

Environmental and legal matters Environmental and legal matters (Details)	Jan. 27, 2020 USD ($)	Mar. 03, 2017
IBAMA allegations
Loss Contingencies
Proposed fine by IBAMA	$ 300,000
IRS investigation
Loss Contingencies
Number of facilities served search and seizure warrants		3