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Segment Reporting - Net Income by Segment (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Apr. 27, 2013 | Jan. 26, 2013 | Oct. 27, 2012 | Jul. 28, 2012 | Apr. 28, 2012 | Jan. 28, 2012 | Oct. 29, 2011 | Jul. 30, 2011 | Apr. 27, 2013 segment | Apr. 28, 2012 | Apr. 30, 2011
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Number of business units |  |  |  |  |  |  |  |  | 5 |  |
Net sales | $ 124,482 | $ 111,050 | $ 149,871 | $ 132,919 | $ 111,994 | $ 122,925 | $ 135,910 | $ 118,698 | $ 518,322 | $ 489,526 | $ 441,676
Contribution margin |  |  |  |  |  |  |  |  | 81,135 | 61,204 | 61,929
Non-allocated operating expenses: |  |  |  |  |  |  |  |  |  |  |
General and administrative |  |  |  |  |  |  |  |  | 27,404 | 27,422 | 23,453
Product design and development |  |  |  |  |  |  |  |  | 23,131 | 23,507 | 18,949
Operating income |  |  |  |  |  |  |  |  | 30,600 | 10,275 | 19,527
Nonoperating income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 1,523 | 1,747 | 1,921
Interest expense |  |  |  |  |  |  |  |  | (355) | (335) | (184)
Other (expense) income, net |  |  |  |  |  |  |  |  | (839) | (110) | 877
Income before income taxes |  |  |  |  |  |  |  |  | 30,929 | 11,577 | 22,141
Income tax expense |  |  |  |  |  |  |  |  | 8,150 | 3,088 | 7,897
Net income | 1,844 | 2,710 | 11,547 | 6,678 | (505) | 1,666 | 3,959 | 3,368 | 22,779 | 8,489 | 14,244
Depreciation and amortization |  |  |  |  |  |  |  |  | 15,607 | 17,518 | 19,641
Commerical |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 144,596 | 148,585 | 112,515
Contribution margin |  |  |  |  |  |  |  |  | 24,241 | 24,011 | 12,925
Nonoperating income (expense): |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 4,940 | 6,103 | 6,790
Live Events |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 158,562 | 160,933 | 161,572
Contribution margin |  |  |  |  |  |  |  |  | 19,071 | 13,579 | 18,889
Nonoperating income (expense): |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 4,473 | 5,055 | 6,224
Schools & Theatres |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 66,128 | 59,662 | 62,310
Contribution margin |  |  |  |  |  |  |  |  | 8,150 | 4,716 | 7,247
Nonoperating income (expense): |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,233 | 2,361 | 2,621
Transportation |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 73,270 | 48,284 | 45,215
Contribution margin |  |  |  |  |  |  |  |  | 21,330 | 11,009 | 12,149
Nonoperating income (expense): |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,375 | 1,386 | 1,524
International |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 75,766 | 72,062 | 60,064
Contribution margin |  |  |  |  |  |  |  |  | 8,343 | 7,889 | 10,719
Nonoperating income (expense): |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 717 | 650 | 692
Unallocated corporate depreciation |  |  |  |  |  |  |  |  |  |  |
Nonoperating income (expense): |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 1,869 | $ 1,963 | $ 1,790

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