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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 01, 2020	Jan. 26, 2019	Feb. 01, 2020	Jan. 26, 2019
Disaggregation of Revenue [Line Items]
Disaggregated revenue	$ 127,657	$ 115,069	$ 482,824	$ 441,949
Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	62,940	60,028	222,853	211,086
Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	64,717	55,041	259,971	230,863
Commercial
Disaggregation of Revenue [Line Items]
Disaggregated revenue	36,880	37,159	120,566	113,797
Commercial | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	26,555	28,105	81,562	84,584
Commercial | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	10,325	9,054	39,004	29,213
Live Events
Disaggregation of Revenue [Line Items]
Disaggregated revenue	40,571	29,995	159,196	134,566
Live Events | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	8,614	7,436	30,903	26,796
Live Events | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	31,957	22,559	128,293	107,770
High School Park and Recreation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	14,775	14,798	75,433	74,498
High School Park and Recreation | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	11,080	9,874	55,791	48,932
High School Park and Recreation | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	3,695	4,924	19,642	25,566
Transportation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	13,916	15,390	53,264	50,624
Transportation | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	5,683	4,911	19,901	19,410
Transportation | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	8,233	10,479	33,363	31,214
International
Disaggregation of Revenue [Line Items]
Disaggregated revenue	21,515	17,727	74,365	68,464
International | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	11,008	9,702	34,696	31,364
International | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	10,507	8,025	39,669	37,100
Unique Configuration
Disaggregation of Revenue [Line Items]
Disaggregated revenue	53,231	44,379	223,955	198,709
Unique Configuration | Commercial
Disaggregation of Revenue [Line Items]
Disaggregated revenue	7,209	5,942	29,181	20,417
Unique Configuration | Live Events
Disaggregation of Revenue [Line Items]
Disaggregated revenue	27,459	18,491	114,459	95,695
Unique Configuration | High School Park and Recreation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	1,511	3,053	12,727	18,667
Unique Configuration | Transportation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	7,857	10,095	32,173	30,140
Unique Configuration | International
Disaggregation of Revenue [Line Items]
Disaggregated revenue	9,195	6,798	35,415	33,790
Limited Configuration
Disaggregation of Revenue [Line Items]
Disaggregated revenue	61,351	57,688	219,417	208,060
Limited Configuration | Commercial
Disaggregation of Revenue [Line Items]
Disaggregated revenue	26,304	27,353	80,193	82,605
Limited Configuration | Live Events
Disaggregation of Revenue [Line Items]
Disaggregated revenue	6,436	5,958	25,662	23,243
Limited Configuration | High School Park and Recreation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	12,422	11,036	60,349	53,964
Limited Configuration | Transportation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	5,580	4,692	19,550	18,970
Limited Configuration | International
Disaggregation of Revenue [Line Items]
Disaggregated revenue	10,609	8,649	33,663	29,278
Service and Other
Disaggregation of Revenue [Line Items]
Disaggregated revenue	13,075	13,002	39,452	35,180
Service and Other | Commercial
Disaggregation of Revenue [Line Items]
Disaggregated revenue	3,367	3,864	11,192	10,775
Service and Other | Live Events
Disaggregation of Revenue [Line Items]
Disaggregated revenue	6,676	5,546	19,075	15,628
Service and Other | High School Park and Recreation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	842	709	2,357	1,867
Service and Other | Transportation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	479	603	1,541	1,514
Service and Other | International
Disaggregation of Revenue [Line Items]
Disaggregated revenue	$ 1,711	$ 2,280	$ 5,287	$ 5,396

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