Earnings per Share (Tables)

6 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Reconciliation of Weighted Average Common Shares Outstanding for Purposes of Calculating Basic and Diluted Earnings Per Share

The calculations of basic and diluted net income per share and basic and diluted weighted average shares outstanding are as follows for the three and six months ended March 31, 2018 and 2017 (in thousands, except per share data):

	Three Months Ended				Six Months Ended
	March 31,				March 31,
	2018		2017		2018		2017
Net income	$	67,020	$	14,005	$	83,506	$	27,876
Weighted average common shares outstanding used in computing basic earnings per share		70,220		69,600		70,340		69,388
Dilutive common stock options and restricted stock units		393		549		568		685
Weighted average common shares outstanding used in computing diluted earnings per share		70,613		70,149		70,908		70,073
Basic net income per share	$	0.95	$	0.20	$	1.19	$	0.40
Diluted net income per share	$	0.95	$	0.20	$	1.18	$	0.40