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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 02, 2019	Oct. 27, 2018	Nov. 02, 2019	Oct. 27, 2018
Disaggregation of Revenue [Line Items]
Disaggregated revenue	$ 174,911	$ 172,692	$ 355,167	$ 326,880
Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	83,606	83,907	159,913	151,058
Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	91,305	88,785	195,254	175,822
Commercial
Disaggregation of Revenue [Line Items]
Disaggregated revenue	39,651	46,069	83,686	76,638
Commercial | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	27,304	31,896	55,007	56,479
Commercial | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	12,347	14,173	28,679	20,159
Live Events
Disaggregation of Revenue [Line Items]
Disaggregated revenue	59,319	55,099	118,625	104,571
Live Events | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	13,169	12,558	22,289	19,360
Live Events | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	46,150	42,541	96,336	85,211
High School Park and Recreation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	30,193	31,580	60,658	59,700
High School Park and Recreation | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	22,112	22,060	44,711	39,058
High School Park and Recreation | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	8,081	9,520	15,947	20,642
Transportation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	20,330	18,077	39,348	35,234
Transportation | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	7,521	7,267	14,218	14,499
Transportation | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	12,809	10,810	25,130	20,735
International
Disaggregation of Revenue [Line Items]
Disaggregated revenue	25,418	21,867	52,850	50,737
International | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	13,500	10,126	23,688	21,662
International | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	11,918	11,741	29,162	29,075
Unique Configuration
Disaggregation of Revenue [Line Items]
Disaggregated revenue	78,567	77,583	170,724	154,330
Unique Configuration | Commercial
Disaggregation of Revenue [Line Items]
Disaggregated revenue	9,007	11,426	21,972	14,475
Unique Configuration | Live Events
Disaggregation of Revenue [Line Items]
Disaggregated revenue	41,413	38,283	87,000	77,204
Unique Configuration | High School Park and Recreation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	5,186	6,671	11,216	15,614
Unique Configuration | Transportation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	12,419	10,427	24,316	20,045
Unique Configuration | International
Disaggregation of Revenue [Line Items]
Disaggregated revenue	10,542	10,776	26,220	26,992
Limited Configuration
Disaggregation of Revenue [Line Items]
Disaggregated revenue	82,801	84,279	158,066	150,372
Limited Configuration | Commercial
Disaggregation of Revenue [Line Items]
Disaggregated revenue	26,654	31,385	53,889	55,252
Limited Configuration | Live Events
Disaggregation of Revenue [Line Items]
Disaggregated revenue	11,513	11,467	19,226	17,285
Limited Configuration | High School Park and Recreation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	24,127	24,381	47,927	42,928
Limited Configuration | Transportation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	7,383	7,195	13,970	14,278
Limited Configuration | International
Disaggregation of Revenue [Line Items]
Disaggregated revenue	13,124	9,851	23,054	20,629
Service and Other
Disaggregation of Revenue [Line Items]
Disaggregated revenue	13,543	10,830	26,377	22,178
Service and Other | Commercial
Disaggregation of Revenue [Line Items]
Disaggregated revenue	3,990	3,258	7,825	6,911
Service and Other | Live Events
Disaggregation of Revenue [Line Items]
Disaggregated revenue	6,393	5,349	12,399	10,082
Service and Other | High School Park and Recreation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	880	528	1,515	1,158
Service and Other | Transportation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	528	455	1,062	911
Service and Other | International
Disaggregation of Revenue [Line Items]
Disaggregated revenue	$ 1,752	$ 1,240	$ 3,576	$ 3,116

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