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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		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Line Items]
Net income per common share available to common shareholders - Basic	$ 0.38	$ 0.10	$ 0.93	$ 1.07
Shares used in computing net income per common share available to common shareholders - Basic	34,699	23,282	34,607	23,279
Net income per common share available to common shareholders - Diluted	$ 0.38	$ 0.10	$ 0.92	$ 1.06
Shares used in computing net income per common share available to common shareholders - Diluted	34,962	23,570	35,041	23,530
As Previously Reported
Earnings Per Share [Line Items]
Net income per common share available to common shareholders - Basic		$ 0.20		$ 2.18
Shares used in computing net income per common share available to common shareholders - Basic		11,592		11,441
Net income per common share available to common shareholders - Diluted		$ 0.10		$ 1.06
Shares used in computing net income per common share available to common shareholders - Diluted		23,563		23,563
As Restated
Earnings Per Share [Line Items]
Net income per common share available to common shareholders - Basic		$ 0.10		$ 1.07
Shares used in computing net income per common share available to common shareholders - Basic		23,282		23,279
Net income per common share available to common shareholders - Diluted		$ 0.10		$ 1.06
Shares used in computing net income per common share available to common shareholders - Diluted		23,570		23,530

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