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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

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