Earnings Per Share (Tables)

6 Months Ended

Mar. 31, 2012

Earnings Per Share [Abstract]

Components Of Basic And Diluted Earnings Per Common Share

	Three Months Ended March 31						Six Months Ended March 31
	2012			2011			2012			2011
	(Dollars and shares in millions, except per share amounts)
Basic EPS:
Net income attributable to Cabot Corporation	$	240		$	51		$	286		$	126
Less: Dividends and dividend equivalents to participating securities		—			1			—			1
Less: Undistributed earnings allocated to participating securities(1)		3			1			3			2
Earnings allocated to common shareholders (numerator)	$	237		$	49		$	283		$	123
Weighted average common shares and participating securities outstanding		63.8			65.4			64.0			65.4
Less: Participating securities(1)		0.6			0.8			0.6			0.9
Adjusted weighted average common shares (denominator)		63.2			64.6			63.4			64.5
Amounts per share - basic:
Income from continuing operations attributable to Cabot Corporation	$	0.80		$	0.53		$	1.35		$	1.42
Income from discontinued operations		2.94			0.24			3.11			0.49
Net income attributable to Cabot Corporation	$	3.74		$	0.77		$	4.46		$	1.91
Diluted EPS:
Earnings allocated to common shareholders	$	237		$	49		$	283		$	123
Plus: Earnings allocated to participating securities		3			2			3			3
Less: Adjusted earnings allocated to participating securities(2)		(3	)		(2	)		(3	)		(3	)
Earnings allocated to common shareholders (numerator)	$	237		$	49		$	283		$	123
Adjusted weighted average common shares outstanding		63.2			64.6			63.4			64.5
Effect of dilutive securities:
Common shares issuable(3)		0.8			0.9			0.7			0.8
Adjusted weighted average common shares (denominator)		64.0			65.5			64.1			65.3
Amounts per share - diluted:
Income from continuing operations attributable to Cabot Corporation	$	0.78		$	0.52		$	1.33		$	1.40
Income from discontinued operations		2.92			0.24			3.08			0.49
Net income attributable to Cabot Corporation	$	3.70		$	0.76		$	4.41		$	1.89

⁽¹⁾  Participating securities consist of shares of unvested restricted stock, vested restricted stock awards held by employees in which Cabot has a security interest, and unvested time-based restricted stock units.

Calculation Of Undistributed Earnings

	Three Months Ended March 31				Six Months Ended March 31
	2012		2011		2012		2011
	(Dollars in millions)
Calculation of undistributed earnings:
Net income attributable to Cabot Corporation	$	240	$	51	$	286	$	126
Less: Dividends declared on common stock		12		11		24		23
Less: Dividends declared on participating securities		—		1		—		1
Undistributed earnings	$	228	$	39	$	262	$	102
Allocation of undistributed earnings:
Undistributed earnings allocated to common shareholders	$	225	$	38	$	259	$	100
Undistributed earnings allocated to participating shareholders		3		1		3		2
Undistributed earnings	$	228	$	39	$	262	$	102

⁽²⁾  Undistributed earnings are adjusted for the assumed distribution of dividends to the dilutive securities, which are described in (3) below, and then reallocated to participating securities.

⁽³⁾  Represents incremental shares of common stock from the (i) assumed exercise of stock options issued under Cabot's equity incentive plans; (ii) assumed issuance of shares to employees pursuant to the Company's Supplemental Retirement Savings Plan; and (iii) assumed issuance of shares under outstanding performance-based stock unit awards issued under Cabot's equity incentive plans. For the three and six months ended March 31, 2012 , 304,000 and 539,000 incremental shares of common stock, respectively, were not included in the calculation of diluted earnings per share because the inclusion of these shares would have been antidilutive. For the three and six months ended March 31, 2011, 198,000 and 273,000 incremental shares of common stock, respectively, were not included in the calculation of diluted earnings per share because the inclusion of these shares would have been antidilutive.