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STOCK-BASED COMPENSATION - Stock option activity (Details) - ¥ / shares						12 Months Ended
	Jan. 02, 2020	Jan. 02, 2019	Mar. 01, 2018	Jan. 02, 2018	Oct. 02, 2017	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Tranche 9 [Member]
Grant date						Jan. 02, 2014
Options outstanding						34,500	34,500
Options exercised						0
Options cancelled/expired						(34,500)
Options outstanding						0	34,500	34,500
Options vested and exercisable							34,500
Weighted average fair value at the grant date (USD)						¥ 6.50
Tranche 10 [Member]
Grant date						Jan. 02, 2015
Options outstanding						19,500
Options exercised						0
Options cancelled/expired						(19,500)		(19,500)
Options outstanding						0	19,500
Options vested and exercisable							19,500
Weighted average fair value at the grant date (USD)						¥ 7.50
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)						¥ 9.00
Tranche 12 [Member]
Grant date						Apr. 19, 2016
Options outstanding						60,000	60,000
Options exercised						0
Options outstanding						60,000	60,000	60,000
Options vested and exercisable						60,000	60,000
Weighted average fair value at the grant date (USD)						¥ 15.40
Tranche 13 [Member]
Grant date						May 16, 2016
Options outstanding						20,000	20,000
Options exercised						0
Options outstanding						20,000	20,000	20,000
Options vested and exercisable						20,000	20,000
Weighted average fair value at the grant date (USD)						¥ 12.40
Tranche 14 [Member]
Grant date						Aug. 03, 2016
Options outstanding						20,000	20,000
Options exercised						0
Options outstanding						20,000	20,000	20,000
Options vested and exercisable						20,000	20,000
Weighted average fair value at the grant date (USD)						¥ 14.40
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)						¥ 4.00
Tranche 16 [Member]
Grant date						Oct. 02, 2017
Options outstanding						2,500	2,500
Number of options granted					2,500
Options exercised						0
Options outstanding						2,500	2,500	2,500
Options vested and exercisable						2,500	2,500
Weighted average fair value at the grant date (USD)						¥ 7.70
Tranche 17 [Member]
Grant date						Dec. 22, 2017
Options outstanding						8,800	8,800
Options exercised						0
Options outstanding						8,800	8,800	8,800
Options vested and exercisable						8,800	8,800
Weighted average fair value at the grant date (USD)						¥ 4.40
Tranche 18 [Member]
Grant date						Jan. 02, 2018
Options outstanding						29,000	29,000
Number of options granted				29,000
Options exercised						0
Options outstanding						29,000	29,000	29,000
Options vested and exercisable						29,000	29,000
Weighted average fair value at the grant date (USD)						¥ 5.10
Tranche 19 [Member]
Grant date						Mar. 01, 2018
Options outstanding						20,000	20,000
Number of options granted			20,000
Options exercised						0
Options outstanding						20,000	20,000	20,000
Options vested and exercisable						20,000	20,000
Weighted average fair value at the grant date (USD)						¥ 5.10
Tranche 20 [Member]
Grant date						Jan. 02, 2019
Options outstanding						36,000	0
Number of options granted		36,000					36,000
Options exercised						0
Options outstanding						36,000	36,000	0
Options vested and exercisable						36,000	36,000
Weighted average fair value at the grant date (USD)						¥ 4.00
Tranche 21 [Member]
Grant date						Jan. 02, 2020
Options outstanding						38,000	0
Number of options granted	38,000						38,000
Options exercised						0
Options outstanding						38,000	38,000	0
Options vested and exercisable						38,000	38,000
Weighted average fair value at the grant date (USD)						¥ 2.50

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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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Net number of share options (or share units) granted during the period.

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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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