Earnings (Loss) Per Share - Summary of Net Income Per Unit (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Numerator:
Net (loss) income	$ (51,313)	$ 68,910	$ (125,866)	$ 73,795
Less: Net income (loss) attributable to noncontrolling interests	3,137	$ 0	(88,193)	$ 0
Net loss attributable to Weber Inc. - basic	$ (54,450)		$ (37,673)
Denominator:
Weighted average Class A Common stock outstanding - basic (in shares)	53,437,683		53,370,823
Net income per Class A common stock - basic (in dollars per share)	$ (1.02)		$ (0.71)
Net loss per Class A common stock - diluted (in dollars per share)	$ (1.02)		$ (0.71)