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Net loss per share attributable to common stockholders - Computation (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net loss attributable to common stockholders	$ (152,098)	$ (139,931)	$ (107,669)
Denominator:
Weighted-average shares used in computing net loss per share, basic and diluted (in shares)	48,251	39,190	27,462
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (3.15)	$ (3.57)	$ (3.92)

X

- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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