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Segment Disclosure - Net Income by Segment (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Oct. 27, 2012
Oct. 29, 2011
Oct. 27, 2012
segment
Oct. 29, 2011
Segment Reporting Information        
Number of business units     5  
Net sales $ 149,871 $ 135,910 $ 282,790 $ 254,607
Contribution margin 29,556 18,544 52,866 35,841
Non-allocated operating expenses:        
General and administrative 6,850 6,972 13,431 13,436
Product design and development 5,845 5,636 11,866 11,353
Operating income 16,861 5,936 27,569 11,052
Nonoperating income (expense):        
Interest income 348 457 779 892
Interest expense (36) (95) (123) (171)
Other income (expense), net 150 (47) (30) (193)
Income before income taxes 17,323 6,251 28,195 11,580
Income tax expense 5,776 2,292 9,970 4,253
Net income 11,547 3,959 18,225 7,327
Depreciation and amortization 3,955 4,359 7,831 9,010
Commerical
        
Segment Reporting Information        
Net sales 39,773 43,704 78,130 76,407
Contribution margin 8,566 7,449 14,768 11,987
Nonoperating income (expense):        
Depreciation and amortization 1,213 1,517 2,493 3,198
Live Events
        
Segment Reporting Information        
Net sales 50,604 46,664 95,113 85,181
Contribution margin 8,073 6,021 15,149 9,429
Nonoperating income (expense):        
Depreciation and amortization 1,161 1,257 2,265 2,568
Schools & Theatres
        
Segment Reporting Information        
Net sales 21,688 17,239 39,861 35,721
Contribution margin 3,434 1,409 6,011 4,809
Nonoperating income (expense):        
Depreciation and amortization 562 581 1,138 1,220
Transportation
        
Segment Reporting Information        
Net sales 17,571 12,439 34,167 23,939
Contribution margin 6,025 2,795 12,004 6,139
Nonoperating income (expense):        
Depreciation and amortization 345 339 669 700
International
        
Segment Reporting Information        
Net sales 20,235 15,864 35,519 33,359
Contribution margin 3,458 870 4,934 3,477
Nonoperating income (expense):        
Depreciation and amortization 222 166 359 330
Unallocated
        
Nonoperating income (expense):        
Depreciation and amortization $ 452 $ 499 $ 907 $ 994