Earnings per Share (Tables)

12 Months Ended

Sep. 30, 2011

Earnings per Share [Abstract]

Net components of basic and diluted earnings per share

	Fiscal Years Ended September 30,
	2011		2010		2009
	(In thousands, except per share amounts)
Net income (A)	$	122,159	$	97,294	$	68,472
Weighted average outstanding shares of common stock (B)		49,917		49,033		47,372
Dilutive effect of stock options and restricted stock		452		543		704
Weighted average common stock and common stock equivalents (C)		50,369		49,576		48,076
Basic earnings per share (A/B)	$	2.45	$	1.98	$	1.45
Diluted earnings per share (A/C)	$	2.43	$	1.96	$	1.42
Potential common shares excluded from the calculation of diluted earnings per share		2		15		124