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Advertising Costs	12 Months Ended
Advertising Costs	Apr. 30, 2017
Marketing And Advertising Expense [Abstract]
Advertising Costs	7. Advertising Costs We expense advertising costs, primarily consisting of magazine advertisements, printed materials, and television advertisements, either as incurred or upon the first occurrence of the advertising. Advertising expense, included in selling and marketing expenses for the fiscal years ended April 30, 2017, 2016, and 2015, amounted to $22.3 million, $21.8 million, and $20.2 million, respectively.