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Earnings Per Share and Equity - Summary of Basic and Diluted Net Income per Common Share Available to Common Shareholders (Detail) - $ / shares shares in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Line Items]
Net income per common share available to common shareholders - Basic	$ 0.09	$ (0.48)	$ 1.02	$ 0.59
Shares used in computing net income per common share available to common shareholders - Basic	34,835	23,336	34,683	23,298
Net income per common share available to common shareholders - Diluted	$ 0.09	$ (0.48)	$ 1.01	$ 0.58
Shares used in computing net income per common share available to common shareholders - Diluted	35,112	23,336	35,051	23,772
As Previously Reported
Earnings Per Share [Line Items]
Net income per common share available to common shareholders - Basic		$ (0.89)		$ 1.18
Shares used in computing net income per common share available to common shareholders - Basic		12,462		11,782
Net income per common share available to common shareholders - Diluted		$ (0.89)		$ 0.58
Shares used in computing net income per common share available to common shareholders - Diluted		12,462		24,052
As Restated
Earnings Per Share [Line Items]
Net income per common share available to common shareholders - Basic		$ (0.48)		$ 0.59
Shares used in computing net income per common share available to common shareholders - Basic		23,336		23,298
Net income per common share available to common shareholders - Diluted		$ (0.48)		$ 0.58
Shares used in computing net income per common share available to common shareholders - Diluted		23,336		23,772

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