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Segment Disclosure - Net Income by Segment (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Oct. 26, 2013
Oct. 27, 2012
Oct. 26, 2013
segment
Oct. 27, 2012
Segment Reporting Information        
Number of business units     5  
Net sales $ 161,639 $ 149,871 $ 300,361 $ 282,790
Contribution margin 30,061 29,556 51,945 52,866
Depreciation and amortization        
Depreciation and amortization 3,549 3,955 7,371 7,831
Non-allocated operating expenses:        
General and administrative 6,804 6,850 14,103 13,431
Product design and development 5,692 5,845 11,681 11,866
Operating income 17,565 16,861 26,161 27,569
Nonoperating income (expense):        
Interest income 312 348 655 779
Interest expense (12) (36) (127) (123)
Other income (expense), net 278 150 (114) (30)
Income before income taxes 18,143 17,323 26,575 28,195
Income tax expense 6,353 5,776 9,066 9,970
Net income 11,790 11,547 17,509 18,225
Commerical
        
Segment Reporting Information        
Net sales 44,973 39,773 78,674 78,130
Contribution margin 10,179 8,566 16,123 14,768
Depreciation and amortization        
Depreciation and amortization 1,065 1,213 2,117 2,493
Live Events
        
Segment Reporting Information        
Net sales 58,175 50,604 113,252 95,113
Contribution margin 10,287 8,073 18,629 15,149
Depreciation and amortization        
Depreciation and amortization 1,115 1,161 2,262 2,265
Schools & Theatres
        
Segment Reporting Information        
Net sales 18,823 21,688 36,740 39,861
Contribution margin 2,355 3,434 5,503 6,011
Depreciation and amortization        
Depreciation and amortization 529 562 1,075 1,138
Transportation
        
Segment Reporting Information        
Net sales 15,238 17,571 28,280 34,167
Contribution margin 4,760 6,025 6,905 12,004
Depreciation and amortization        
Depreciation and amortization 278 345 564 669
International
        
Segment Reporting Information        
Net sales 24,430 20,235 43,415 35,519
Contribution margin 2,480 3,458 4,785 4,934
Depreciation and amortization        
Depreciation and amortization 183 222 419 359
Unallocated
        
Depreciation and amortization        
Depreciation and amortization $ 379 $ 452 $ 934 $ 907