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EARNINGS PER SHARE
 12 Months Ended
Sep. 30, 2020
Earnings Per Share [Abstract]  
EARNINGS PER SHARE EARNINGS PER SHARE

Basic EPS (and diluted EPS in periods when a loss exists) was calculated by dividing income available to common shareholders by the weighted average number of shares of common stock outstanding during the period. Diluted EPS was calculated by dividing income available to common shareholders by the weighted average number of shares of common stock outstanding plus additional common shares that could be issued in connection with stock based compensation. In August 2020, Griffon Corporation completed the Public Offering of 8,700,000 shares of our common stock at a price of $21.50 per share. Total proceeds, net of fees, were $178,165.
 
The following table is a reconciliation of the share amounts (in thousands) used in computing basic and diluted EPS for 2020, 2019 and 2018 :
 
2020
 
2019
 
2018
Common shares outstanding
56,130

 
46,806

 
45,675

Unallocated ESOP shares
(2,058
)
 
(2,259
)
 
(2,477
)
Non-vested restricted stock
(3,556
)
 
(3,420
)
 
(2,522
)
Impact of weighted average shares
(7,928
)
 
(193
)
 
329

Weighted average shares outstanding - basic
42,588

 
40,934

 
41,005

Incremental shares from stock based compensation
2,427

 
1,954

 
1,417

Weighted average shares outstanding - diluted
45,015

 
42,888

 
42,422


 
Anti-dilutive shares were not material. Shares of the ESOP that have been allocated to employee accounts are treated as outstanding in determining earnings per share.