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STOCK-BASED COMPENSATION - Stock option activity (Details) - ¥ / shares			12 Months Ended
	Apr. 14, 2021	Jan. 02, 2019	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Tranche 9 [Member]
Grant date			Jan. 02, 2014
Options outstanding				34,500
Options exercised			0
Options cancelled/expired				(34,500)
Options outstanding			0		34,500
Weighted average fair value at the grant date (USD)			¥ 6.5
Tranche 10 [Member]
Grant date			Jan. 02, 2015
Options exercised			0
Options cancelled/expired				(19,500)	(19,500)
Options outstanding			0
Weighted average fair value at the grant date (USD)			¥ 7.5
Tranche 11 [Member]
Grant date			Jan. 04, 2016
Options outstanding			13,500	13,500
Options exercised			0
Options outstanding			13,500	13,500	13,500
Options vested and exercisable			13,500	13,500
Weighted average fair value at the grant date (USD)			¥ 9.0
Tranche 12 [Member]
Grant date			Apr. 19, 2016
Options outstanding			60,000	60,000
Options exercised			0
Options cancelled/expired			(60,000)
Options outstanding			0	60,000	60,000
Options vested and exercisable				60,000
Weighted average fair value at the grant date (USD)			¥ 15.4
Tranche 13 [Member]
Grant date			May 16, 2016
Options outstanding			20,000	20,000
Options exercised			0
Options cancelled/expired			(20,000)
Options outstanding			0	20,000	20,000
Options vested and exercisable				20,000
Weighted average fair value at the grant date (USD)			¥ 12.4
Tranche 14 [Member]
Grant date			Aug. 03, 2016
Options outstanding			20,000	20,000
Options exercised			0
Options cancelled/expired			(20,000)
Options outstanding			0	20,000	20,000
Options vested and exercisable				20,000
Weighted average fair value at the grant date (USD)			¥ 14.4
Tranche 15 [Member]
Grant date			Jan. 03, 2017
Options outstanding			18,000	18,000
Options exercised			0
Options outstanding			18,000	18,000	18,000
Options vested and exercisable			18,000	18,000
Weighted average fair value at the grant date (USD)			¥ 4.0
Tranche 16 [Member]
Grant date			Oct. 02, 2017
Options outstanding			2,500	2,500
Number of options granted		36,000
Options exercised			0
Options cancelled/expired			(2,500)
Options outstanding			0	2,500	2,500
Options vested and exercisable				2,500
Weighted average fair value at the grant date (USD)			¥ 7.7
Tranche 17 [Member]
Grant date			Dec. 22, 2017
Options outstanding			8,800	8,800
Options exercised			(1,000)
Options cancelled/expired			(6,000)
Options outstanding			1,800	8,800	8,800
Options vested and exercisable			1,800	8,800
Weighted average fair value at the grant date (USD)			¥ 4.4
Tranche 18 [Member]
Grant date			Jan. 02, 2018
Options outstanding			29,000	29,000
Number of options granted	160,000
Options exercised			0
Options cancelled/expired			(10,000)
Options outstanding			19,000	29,000	29,000
Options vested and exercisable			19,000	29,000
Weighted average fair value at the grant date (USD)			¥ 5.1
Tranche 19 [Member]
Grant date			Mar. 01, 2018
Options outstanding			20,000	20,000
Options exercised			0
Options outstanding			0	20,000	20,000
Options vested and exercisable				20,000
Weighted average fair value at the grant date (USD)			¥ 5.1
Tranche 20 [Member]
Grant date			Jan. 02, 2019
Options outstanding			36,000	36,000
Options exercised			0
Options outstanding			0	36,000	36,000
Options vested and exercisable				36,000
Weighted average fair value at the grant date (USD)			¥ 4.0
Tranche 21 [Member]
Grant date			Jan. 02, 2020
Options outstanding			38,000	38,000
Options exercised			0
Options outstanding			0	38,000	38,000
Options vested and exercisable				38,000
Weighted average fair value at the grant date (USD)			¥ 2.5
Tranche 22 [Member]
Options outstanding				0
Number of options granted			160,000
Options exercised			(20,930)
Options outstanding			139,070		0
Options vested and exercisable			139,070
Weighted average fair value at the grant date (USD)			¥ 12.5

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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