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Business combinations - Acquisition of Jiangxi Xiangbo (Details)			6 Months Ended
	Sep. 27, 2021 CNY (¥)	Sep. 27, 2021 USD ($)	Mar. 31, 2022 CNY (¥) item	Mar. 31, 2022 USD ($) item	Mar. 31, 2022 USD ($)	Oct. 25, 2021
Business Acquisition [Line Items]
Number of acquisitions			2	2
Jiangxi Xiangbo
Business Acquisition [Line Items]
Percentage of equity interest acquired (in percent)						100.00%
Summary of allocation of the purchase price as of the date of acquisition
Net tangible assets (i)			¥ 75,528,400		$ 11,914,312
Goodwill			(5,528,400)		(872,084)
Total fair value of purchase price allocation	¥ 70,000,000	$ 11,000,000	70,000,000	$ 11,042,228
Forestry			¥ 75,500,000		$ 11,900,000

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The amount of forestry recognized as of the acquisition date.

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The amount of net tangible assets recognized as of the acquisition date.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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