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Segment Disclosure - Net Income by Segment (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Aug. 02, 2014
segment
Jul. 27, 2013
Segment Reporting Information    
Number of business units 5  
Net sales $ 166,618 $ 138,722
Contribution margin 28,357 21,884
Depreciation and amortization    
Depreciation and amortization 3,716 3,822
Non-allocated operating expenses:    
General and administrative 7,937 7,299
Product design and development 6,803 5,989
Operating income 13,617 8,596
Nonoperating income (expense):    
Interest income 300 343
Interest expense (68) (115)
Other (expense) income, net (172) (392)
Income before income taxes 13,677 8,432
Income tax expense 4,932 2,712
Net income 8,745 5,720
Commerical
    
Segment Reporting Information    
Net sales 39,782 33,701
Contribution margin 6,912 5,944
Depreciation and amortization    
Depreciation and amortization 1,207 1,052
Live Events
    
Segment Reporting Information    
Net sales 75,674 55,077
Contribution margin 12,047 8,342
Depreciation and amortization    
Depreciation and amortization 1,147 1,147
Schools & Theatres
    
Segment Reporting Information    
Net sales 20,111 17,917
Contribution margin 5,158 3,148
Depreciation and amortization    
Depreciation and amortization 453 546
Transportation
    
Segment Reporting Information    
Net sales 13,313 13,042
Contribution margin 3,281 2,145
Depreciation and amortization    
Depreciation and amortization 265 286
International
    
Segment Reporting Information    
Net sales 17,738 18,985
Contribution margin 959 2,305
Depreciation and amortization    
Depreciation and amortization 250 236
Unallocated
    
Depreciation and amortization    
Depreciation and amortization $ 394 $ 555