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Segment Reporting - Net Income by Segment (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 28, 2018 USD ($)	Jan. 27, 2018 USD ($)	Oct. 28, 2017 USD ($)	Jul. 29, 2017 USD ($)	Apr. 29, 2017 USD ($)	Jan. 28, 2017 USD ($)	Oct. 29, 2016 USD ($)	Jul. 30, 2016 USD ($)	Apr. 28, 2018 USD ($) segment	Apr. 29, 2017 USD ($)	Apr. 30, 2016 USD ($)
Segment Reporting Information
Number of business units | segment									5
Net sales	$ 138,177	$ 130,316	$ 169,309	$ 172,728	$ 143,682	$ 115,719	$ 169,992	$ 157,146	$ 610,530	$ 586,539	$ 570,168
Gross profit	29,852	28,567	42,604	44,646	33,724	23,316	44,308	39,067	145,669	140,415	121,019
Non-allocated operating expenses:
General and administrative									34,919	34,226	32,801
Product design and development									35,530	29,081	26,911
Operating income									12,460	15,421	2,495
Nonoperating income (expense):
Interest income									723	751	987
Interest expense									(217)	(230)	(228)
Other (expense) income, net									(537)	(354)	(128)
Income before income taxes									12,429	15,588	3,126
Income tax expense									6,867	5,246	1,065
Net income	$ (3,810)	$ (6,189)	$ 7,132	$ 8,429	$ 909	$ (5,127)	$ 9,021	$ 5,539	5,562	10,342	2,061
Depreciation, amortization, and impairment									17,784	19,392	16,943
Commerical
Segment Reporting Information
Net sales									134,535	148,073	148,261
Nonoperating income (expense):
Depreciation, amortization, and impairment									6,199	6,337	4,925
Live Events
Segment Reporting Information
Net sales									236,333	213,982	205,151
Nonoperating income (expense):
Depreciation, amortization, and impairment									4,783	5,032	4,970
High School Park and Recreation
Segment Reporting Information
Net sales									87,627	82,798	70,035
Nonoperating income (expense):
Depreciation, amortization, and impairment									1,646	1,725	1,722
Transportation
Segment Reporting Information
Net sales									59,578	52,426	52,249
Nonoperating income (expense):
Depreciation, amortization, and impairment									1,138	1,267	1,364
International
Segment Reporting Information
Net sales									92,457	89,260	94,472
Nonoperating income (expense):
Depreciation, amortization, and impairment									1,163	2,317	1,227
Unallocated corporate depreciation
Nonoperating income (expense):
Depreciation, amortization, and impairment									2,855	2,714	2,735
Operating Segments [Member]
Segment Reporting Information
Gross profit									145,669	140,415	121,019
Contribution Margin									82,909	78,728	62,207
Operating Segments [Member] | Commerical
Segment Reporting Information
Gross profit									26,665	36,514	29,147
Contribution Margin									7,986	18,046	13,210
Operating Segments [Member] | Live Events
Segment Reporting Information
Gross profit									49,755	40,810	36,568
Contribution Margin									35,439	27,750	23,178
Operating Segments [Member] | High School Park and Recreation
Segment Reporting Information
Gross profit									29,317	26,388	20,624
Contribution Margin									18,317	16,114	10,314
Operating Segments [Member] | Transportation
Segment Reporting Information
Gross profit									21,247	18,027	16,572
Contribution Margin									17,048	13,465	12,466
Operating Segments [Member] | International
Segment Reporting Information
Gross profit									18,685	18,676	18,108
Contribution Margin									$ 4,119	$ 3,353	$ 3,039

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