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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, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]    
Net income (loss) $ 13,871 $ (4,648)
Weighted average common shares outstanding used in computing basic earnings (losses) per share 69,181 68,130
Dilutive restricted stock units 689 0
Weighted average common shares outstanding used in computing diluted earnings (losses) per share 69,870 68,130
Basic net income (loss) per share (USD per share) $ 0.20 $ (0.07)
Diluted net income (loss) per share (USD per share) $ 0.20 $ (0.07)