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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Aug. 03, 2019	Jul. 28, 2018
Disaggregation of Revenue [Line Items]
Disaggregated revenue	$ 180,256	$ 154,188
Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	76,307	67,151
Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	103,949	87,037
Commercial
Disaggregation of Revenue [Line Items]
Disaggregated revenue	44,035	30,569
Commercial | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	27,703	24,583
Commercial | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	16,332	5,986
Live Events
Disaggregation of Revenue [Line Items]
Disaggregated revenue	59,306	49,472
Live Events | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	9,120	6,802
Live Events | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	50,186	42,670
High School Park and Recreation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	30,465	28,120
High School Park and Recreation | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	22,599	16,998
High School Park and Recreation | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	7,866	11,122
Transportation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	19,018	17,157
Transportation | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	6,697	7,232
Transportation | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	12,321	9,925
International
Disaggregation of Revenue [Line Items]
Disaggregated revenue	27,432	28,870
International | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	10,188	11,536
International | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	17,244	17,334
Unique Configuration
Disaggregation of Revenue [Line Items]
Disaggregated revenue	92,157	76,747
Unique Configuration | Commercial
Disaggregation of Revenue [Line Items]
Disaggregated revenue	12,965	3,049
Unique Configuration | Live Events
Disaggregation of Revenue [Line Items]
Disaggregated revenue	45,587	38,921
Unique Configuration | High School Park and Recreation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	6,030	8,943
Unique Configuration | Transportation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	11,897	9,618
Unique Configuration | International
Disaggregation of Revenue [Line Items]
Disaggregated revenue	15,678	16,216
Limited Configuration
Disaggregation of Revenue [Line Items]
Disaggregated revenue	75,265	66,093
Limited Configuration | Commercial
Disaggregation of Revenue [Line Items]
Disaggregated revenue	27,235	23,867
Limited Configuration | Live Events
Disaggregation of Revenue [Line Items]
Disaggregated revenue	7,713	5,818
Limited Configuration | High School Park and Recreation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	23,800	18,547
Limited Configuration | Transportation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	6,587	7,083
Limited Configuration | International
Disaggregation of Revenue [Line Items]
Disaggregated revenue	9,930	10,778
Service and Other
Disaggregation of Revenue [Line Items]
Disaggregated revenue	12,834	11,348
Service and Other | Commercial
Disaggregation of Revenue [Line Items]
Disaggregated revenue	3,835	3,653
Service and Other | Live Events
Disaggregation of Revenue [Line Items]
Disaggregated revenue	6,006	4,733
Service and Other | High School Park and Recreation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	635	630
Service and Other | Transportation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	534	456
Service and Other | International
Disaggregation of Revenue [Line Items]
Disaggregated revenue	$ 1,824	$ 1,876

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