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Consolidated Statements of Income and Comprehensive Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Income Statement [Abstract]    
Net sales $ 147,763 [1] $ 131,869
Cost of sales 88,893 [1] 82,751
Gross profit 58,870 [1] 49,118
Operating expenses:    
Research and development 2,396 1,457
Selling and marketing 9,219 7,947
General and administrative 17,438 14,039
Total operating expenses 29,053 23,443
Operating income 29,817 [1] 25,675
Other (expense)/income:    
Other (expense)/income, net (6) (6)
Interest income 51 24
Interest expense (7,251) (1,984)
Total other (expense)/income, net (7,206) (1,966)
Income from operations before income taxes 22,611 23,709
Income tax expense 8,199 [1] 9,153
Net income 14,412 14,556
Comprehensive income:    
Fair market value adjustment of interest rate swap (181)  
Other comprehensive loss, before income taxes (181)  
Income tax benefit on other comprehensive income 65  
Other comprehensive loss, net of tax (116)  
Comprehensive income $ 14,296 $ 14,556
Net income per share:    
Basic $ 0.27 $ 0.27
Diluted $ 0.26 $ 0.26
Weighted average number of common shares outstanding:    
Basic 54,218 54,829
Diluted 55,477 56,145
[1] We operated under one segment in the three month period ended July 31, 2014; thus, no comparative segment information is presented.