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Segment Reporting - Net Income by Segment (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 27, 2019 USD ($)	Jan. 26, 2019 USD ($)	Oct. 27, 2018 USD ($)	Jul. 28, 2018 USD ($)	Apr. 28, 2018 USD ($)	Jan. 27, 2018 USD ($)	Oct. 28, 2017 USD ($)	Jul. 29, 2017 USD ($)	Apr. 27, 2019 USD ($) segment	Apr. 28, 2018 USD ($)	Apr. 29, 2017 USD ($)
Segment Reporting Information
Number of business units | segment									5
Net sales	$ 127,755	$ 115,069	$ 172,692	$ 154,188	$ 138,177	$ 130,316	$ 169,309	$ 172,728	$ 569,704	$ 610,530	$ 586,539
Gross profit	24,421	24,869	42,757	38,247	29,852	28,567	42,604	44,646	130,294	145,669	140,415
Non-allocated operating expenses:
General and administrative									34,817	34,919	34,226
Product design and development									35,557	35,530	29,081
Operating income									(4,728)	12,460	15,421
Nonoperating income (expense):
Interest income									1,031	723	751
Interest expense									(160)	(217)	(230)
Other (expense) income, net									(1,087)	(537)	(354)
Income before income taxes									(4,944)	12,429	15,588
Income tax (benefit) expense									(3,986)	6,867	5,246
Net (loss) income	$ (10,819)	$ (3,319)	$ 8,606	$ 4,574	$ (3,810)	$ (6,189)	$ 7,132	$ 8,429	(958)	5,562	10,342
Depreciation, amortization, and impairment									18,635	17,784	19,392
Commerical
Segment Reporting Information
Net sales									148,833	134,535	148,073
Nonoperating income (expense):
Depreciation, amortization, and impairment									4,795	6,199	6,337
Live Events
Segment Reporting Information
Net sales									170,952	236,333	213,982
Nonoperating income (expense):
Depreciation, amortization, and impairment									5,194	4,783	5,032
High School Park and Recreation
Segment Reporting Information
Net sales									91,187	87,627	82,798
Nonoperating income (expense):
Depreciation, amortization, and impairment									1,965	1,646	1,725
Transportation
Segment Reporting Information
Net sales									64,391	59,578	52,426
Nonoperating income (expense):
Depreciation, amortization, and impairment									1,102	1,138	1,267
International
Segment Reporting Information
Net sales									94,341	92,457	89,260
Nonoperating income (expense):
Depreciation, amortization, and impairment									2,829	1,163	2,317
Unallocated corporate depreciation
Nonoperating income (expense):
Depreciation, amortization, and impairment									2,750	2,855	2,714
Operating Segments [Member]
Segment Reporting Information
Gross profit									130,294	145,669	140,415
Contribution Margin									65,646	82,909	78,728
Operating Segments [Member] | Commerical
Segment Reporting Information
Gross profit									31,785	26,665	36,514
Contribution Margin									13,218	7,986	18,046
Operating Segments [Member] | Live Events
Segment Reporting Information
Gross profit									32,164	49,755	40,810
Contribution Margin									18,484	35,439	27,750
Operating Segments [Member] | High School Park and Recreation
Segment Reporting Information
Gross profit									26,858	29,317	26,388
Contribution Margin									14,518	18,317	16,114
Operating Segments [Member] | Transportation
Segment Reporting Information
Gross profit									22,525	21,247	18,027
Contribution Margin									18,260	17,048	13,465
Operating Segments [Member] | International
Segment Reporting Information
Gross profit									16,962	18,685	18,676
Contribution Margin									$ 1,166	$ 4,119	$ 3,353

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