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EARNINGS PER SHARE (EPS) | 3 Months Ended
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Dec. 31, 2013
Earnings Per Share [Abstract] |
Earnings Per Share [Text Block] | NOTE 10 – EARNINGS PER SHARE (EPS) Basic EPS 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. The 2017 Notes were anti-dilutive due to the conversion price being greater than the weighted-average stock price during the periods presented. The following table is a reconciliation of the share amounts (in thousands) used in computing earnings per share:
|  | Three Months Ended December 31, |
|  | 2013 |  | 2012 |
Weighted average shares outstanding - basic |  |  | 52,754 |  |  |  | 55,153 |
Incremental shares from stock based compensation |  |  | 1,879 |  |  |  | 2,112 |
Weighted average shares outstanding - diluted |  |  | 54,633 |  |  |  | 57,265 |
Anti-dilutive options excluded from diluted EPS computation |  |  | 710 |  |  |  | 884 |
Griffon has the intent and ability to settle the principal amount of the 2017 Notes in cash, and as such, the potential issuance of shares related to the principal amount of the 2017 Notes does not affect diluted shares.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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