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Segment Disclosure - Net Income by Segment (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jul. 27, 2013
segment
Jul. 28, 2012
Segment Reporting Information    
Number of business units 5  
Net sales $ 138,722 $ 132,919
Contribution margin 21,884 23,310
Depreciation and amortization    
Depreciation and amortization 3,822 3,876
Non-allocated operating expenses:    
General and administrative 7,299 6,581
Product design and development 5,989 6,021
Operating income 8,596 10,708
Nonoperating income (expense):    
Interest income 343 431
Interest expense (115) (87)
Other (expense) income, net (392) (180)
Income before income taxes 8,432 10,872
Income tax expense 2,712 4,194
Net income 5,720 6,678
Commerical
    
Segment Reporting Information    
Net sales 33,701 38,356
Contribution margin 5,944 6,202
Depreciation and amortization    
Depreciation and amortization 1,052 1,280
Live Events
    
Segment Reporting Information    
Net sales 55,077 44,509
Contribution margin 8,342 7,076
Depreciation and amortization    
Depreciation and amortization 1,147 1,104
Schools & Theatres
    
Segment Reporting Information    
Net sales 17,917 18,174
Contribution margin 3,148 2,577
Depreciation and amortization    
Depreciation and amortization 546 576
Transportation
    
Segment Reporting Information    
Net sales 13,042 16,596
Contribution margin 2,145 5,979
Depreciation and amortization    
Depreciation and amortization 286 324
International
    
Segment Reporting Information    
Net sales 18,985 15,284
Contribution margin 2,305 1,476
Depreciation and amortization    
Depreciation and amortization 236 137
Unallocated
    
Depreciation and amortization    
Depreciation and amortization $ 555 $ 455