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Diluted Earnings Per Share for Class A Common Shares Using If-Converted Method (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Apr. 30, 2017
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2016
Apr. 30, 2016
Jan. 31, 2016
Oct. 31, 2015
Jul. 31, 2015
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]                      
Undistributed and distributed earnings, Per basic $ 10,278 $ 2,243 $ 412 $ 1,688 $ 3,406 $ 2,111 $ 2,153 $ 2,572 $ 14,621 $ 10,242 $ 8,128
Basic weighted average common shares outstanding                 29,232 28,727 28,283
Diluted, Class A Common Shares                 29,567 29,005 28,614
Basic, EPS [1]                 $ 0.50 $ 0.36 $ 0.29
Diluted, EPS $ 0.34 $ 0.08 $ 0.01 $ 0.06 $ 0.12 $ 0.07 $ 0.07 $ 0.09 $ 0.49 [1] $ 0.35 [1] $ 0.28 [1]
Class A Common Shares                      
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]                      
Undistributed and distributed earnings, Per basic                 $ 13,413 $ 9,331 $ 7,387
Undistributed and Distributed Earnings, Class B conversion                 1,208 911 741
Net Income (Loss) Available to Common Stockholders, Diluted, Total                 $ 14,621 $ 10,242 $ 8,128
Basic weighted average common shares outstanding                 26,793 26,143 25,696
Common stock equivalents                 335 278 331
Weighted Average Number of Shares Including Common Stock Equivalents, Diluted                 27,128 26,421 26,027
Class B conversion                 2,439 2,584 2,587
Diluted, Class A Common Shares                 29,567 29,005 28,614
Basic, EPS [2]                 $ 0.50 $ 0.36 $ 0.29
Diluted, EPS [2]                 $ 0.49 $ 0.35 $ 0.28
[1] Basic per share amounts are the same for Class A and Class B shares. Diluted per share amounts for Class A shares are shown above. Diluted per share for Class B shares under the two-class method are $0.49, $0.35 and $0.29 for the years ended April 30, 2017, 2016 and 2015, respectively. See Note 1 to the Consolidated Financial Statements.
[2] Amounts adjusted for rounding