Earnings per Share Reconciliation of Weighted Average Common Shares Outstanding for Purposes of Calculating Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Net loss	$ (4,648)	$ (2,734)
Weighted average common shares outstanding used in computing basic earnings per share	68,130	67,126
Weighted average common shares outstanding used in computing basic earnings per share	0	0
Weighted average common shares outstanding used in computing diluted earnings per share	68,130	67,126
Basic net income (loss) per share (USD per share)	$ (0.07)	$ (0.04)
Diluted net income (loss) per share (USD per share)	$ (0.07)	$ (0.04)