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Segment Disclosure - Net Income by Segment (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Jan. 26, 2013
Jan. 28, 2012
Jan. 26, 2013
segment
Jan. 28, 2012
Segment Reporting Information        
Number of business units     5  
Net sales $ 111,050 $ 122,925 $ 393,840 $ 377,532
Contribution margin 13,397 14,514 66,263 50,355
Depreciation and amortization 3,954 4,387 11,785 13,398
Non-allocated operating expenses:        
General and administrative 6,717 6,974 20,148 20,410
Product design and development 5,611 5,696 17,477 17,050
Operating income 1,069 1,844 28,638 12,895
Nonoperating income (expense):        
Interest income 386 434 1,165 1,326
Interest expense (28) (61) (151) (231)
Other expense, net (193) (29) (224) (221)
Income before income taxes 1,234 2,188 29,428 13,769
Income tax (benefit) expense (1,476) 522 8,493 4,775
Net income 2,710 1,666 20,935 8,994
Commerical
        
Segment Reporting Information        
Net sales 30,997 38,833 109,127 115,239
Contribution margin 4,262 6,834 19,030 18,820
Depreciation and amortization 1,253 1,524 3,746 4,721
Live Events
        
Segment Reporting Information        
Net sales 26,528 38,496 121,641 123,676
Contribution margin 1,244 2,643 16,393 12,073
Depreciation and amortization 1,095 1,260 3,361 3,826
Schools & Theatres
        
Segment Reporting Information        
Net sales 11,778 10,696 51,639 46,418
Contribution margin 80 (830) 6,091 3,979
Depreciation and amortization 546 591 1,683 1,807
Transportation
        
Segment Reporting Information        
Net sales 23,546 10,261 57,713 34,201
Contribution margin 6,317 2,080 18,321 8,219
Depreciation and amortization 385 337 1,054 1,043
International
        
Segment Reporting Information        
Net sales 18,201 24,639 53,720 57,998
Contribution margin 1,494 3,787 6,428 7,264
Depreciation and amortization 206 164 565 494
Unallocated
        
Segment Reporting Information        
Depreciation and amortization $ 469 $ 511 $ 1,376 $ 1,507