Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share - Narrative (Details)

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Earnings Per Share - Narrative (Details) - shares
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Antidilutive securities excluded from computation of earnings per share [Line Items]    
Antidilutive securities excluded from computation of earnings per share, amount 2,400,000 700,000
Performance-based stock awards (maximum that can be earned)    
Antidilutive securities excluded from computation of earnings per share [Line Items]    
Antidilutive securities excluded from computation of earnings per share, amount 256,000 400,000