Earnings Per Share (Tables)

6 Months Ended

Mar. 31, 2012

Earnings Per Share

Reconciliation of Net Earnings to Net Earnings Per Share Basic and Diluted

	Three-Months  Ending March 31,				Six-Months Ending March  31,
	2012		2011		2012		2011
Numerator:
Net earnings	$	38,751	$	32,090	$	67,168	$	54,489
Denominator:
Basic shares outstanding		69,077		68,752		68,998		68,782
Dilutive effect of stock options		1,547		1,355		1,506		1,358
Diluted shares outstanding		70,624		70,107		70,504		70,140
Income per common share:
Basic earnings per share	$	0.56	$	0.47	$	0.97	$	0.79
Diluted earnings per share	$	0.55	$	0.46	$	0.95	$	0.78

Anti-dilutive Stock Options Excluded from Computation of Earnings Per Share

	Three-Months  Ending March 31,				Six-Months Ending March  31,
	2012		2011		2012		2011
Options		6		680		39		678
Weighted-average option price	$	40.60	$	32.03	$	34.63	$	32.02

Schedule of Treasury Stock Shares Held for Deferred Compensation Included in Basic and Diluted Shares Outstanding

	Three-Months  Ending March 31,				Six-Months Ending March  31,
	2012		2011		2012		2011
Weighted-average treasury stock shares held for deferred compensation obligations		304		345		307		348