EQUITY - Stock based compensation (Details) - Employee stock options shares in Thousands	9 Months Ended
	Jun. 30, 2021 installment $ / shares shares
EQUITY
Number of installments over which options vest | installment	3
Period over which options granted vest and become exercisable	1 year
Period over which options expire	10 years
Outstanding options (in shares) | shares	712
Granted options (in shares) | shares	295
Exercised options (in shares) | shares	(99)
Forfeited options (in shares) | shares	(34)
Expired options (in shares) | shares	(5)
Outstanding options (in shares) | shares	869
Exercisable options (in shares) | shares	387
Outstanding weighted-average exercise price (in dollars per share) | $ / shares	$ 2.21
Granted weighted-average exercise price (in dollars per share) | $ / shares	21.72
Exercised weighted-average exercise price (in dollars per share) | $ / shares	1.89
Forfeited weighted-average exercise price (in dollars per share) | $ / shares	3.88
Expired weighted-average exercise price (in dollars per share) | $ / shares	2.03
Outstanding weighted-average exercise price (in dollars per share) | $ / shares	8.82
Exercisable weighted-average exercise price (in dollars per share) | $ / shares	$ 1.93