Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share - Narrative (Details)

v3.19.1
Earnings Per Share - Narrative (Details) - shares
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Antidilutive securities excluded from computation of earnings per share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount 1,100,000 1,200,000 900,000 1,000,000
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     400,000 400,000