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Significant Accounting Policies - Reconciliation of Net Income Amounts and Weighted Average Number of Common and Common Equivalent Shares Used to Determine Basic and Diluted Earnings per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Apr. 30, 2018
Jan. 31, 2018
Oct. 31, 2017
Jul. 31, 2017
Apr. 30, 2017
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2016
 [2]
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Earnings Per Share [Abstract]                      
Net income $ 7,664 $ 11,395 [1] $ 3,234 $ (2,165) $ 27,696 $ 32,453 $ 32,483 $ 35,222 $ 20,128 $ 127,854 $ 93,958
Basic earnings, Shares                 54,061 55,930 54,765
Effect of dilutive stock awards, Shares                 773 961 1,200
Diluted earnings, Shares                 54,834 56,891 55,965
Basic earnings, Per Share Amount $ 0.14 [3] $ 0.21 [3] $ 0.06 [3] $ (0.04) [3] $ 0.50 [3] $ 0.58 [3] $ 0.58 [3] $ 0.63 [3] $ 0.37 [3] $ 2.29 [3] $ 1.72
Effect of dilutive stock awards, Per Share Amount                   (0.04) (0.04)
Diluted earnings, Per Share Amount $ 0.14 [3] $ 0.21 [3] $ 0.06 [3] $ (0.04) [3] $ 0.50 [3] $ 0.57 [3] $ 0.57 [3] $ 0.62 [3] $ 0.37 [3] $ 2.25 [3] $ 1.68
[1] Amount includes an income tax benefit of approximately $9.4 million, primarily caused by the effect of Tax Reform, which resulted in the remeasurement of deferred tax assets and liabilities at lower enacted corporate federal tax rates.
[2] Our first quarter results for fiscal 2017 were restated as a result of adopting ASU 2016-09, Compensation – Stock Compensation, during the second quarter of fiscal 2017. As a result of this adoption, net income increased $2.6 million and net income per basic and diluted share increased $0.05 for the three months ended July 31, 2016.
[3] Basic and diluted earnings per share may not equal the sum of the quarterly basic and diluted earnings per share due to rounding.