Earnings per Share

12 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

Earnings per Share

16.    Earnings per Share

The calculations of basic and diluted net income (loss) per share and basic and diluted weighted average shares outstanding are as follows for the fiscal years ended September 30, 2017, 2016 and 2015 (in thousands, except per share data):

	Year Ended September 30,
	2017		2016		2015
Net income (loss)	$	62,612	$	(69,476)	$	14,221
Weighted average common shares outstanding used in computing basic earnings (losses) per share		69,575		68,507		67,411
Dilutive common stock options and restricted stock units		910		—		1,138
Weighted average common shares outstanding used in computing diluted earnings (losses) per share		70,485		68,507		68,549
Basic net income (loss) per share	$	0.90	$	(1.01)	$	0.21
Diluted net income (loss) per share		0.89		(1.01)		0.21

Restricted stock units of 9,500 during fiscal year 2017 were excluded from the computation of diluted earnings per share as their effect would be anti-dilutive based on the treasury stock method. Restricted stock units of 859,000 during fiscal year 2016 were excluded from the computation of diluted earnings per share as a result of a net loss incurred during the period. Approximately 120,000 shares of unvested restricted stock units were excluded from the computation of diluted earnings per share for the fiscal year ended September 30, 2015 as their effect would be anti-dilutive based on the treasury stock method.

On November 8, 2017, the Company’s compensation committee and Board of Directors authorized and approved the annual grant of approximately 468,700 restricted stock units with a grant date of November 8, 2017.