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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jan. 26, 2019	Jan. 26, 2019
Disaggregation of Revenue [Line Items]
Disaggregated revenue	$ 115,069	$ 441,949
Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	60,028	211,086
Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	55,041	230,863
Commercial
Disaggregation of Revenue [Line Items]
Disaggregated revenue	37,159	113,797
Commercial | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	28,105	84,584
Commercial | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	9,054	29,213
Live Events
Disaggregation of Revenue [Line Items]
Disaggregated revenue	29,995	134,566
Live Events | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	7,436	26,796
Live Events | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	22,559	107,770
High School Park and Recreation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	14,798	74,498
High School Park and Recreation | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	9,874	48,932
High School Park and Recreation | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	4,924	25,566
Transportation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	15,390	50,624
Transportation | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	4,911	19,410
Transportation | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	10,479	31,214
International
Disaggregation of Revenue [Line Items]
Disaggregated revenue	17,727	68,464
International | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	9,702	31,364
International | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	8,025	37,100
Unique Configuration
Disaggregation of Revenue [Line Items]
Disaggregated revenue	44,379	198,709
Unique Configuration | Commercial
Disaggregation of Revenue [Line Items]
Disaggregated revenue	5,942	20,417
Unique Configuration | Live Events
Disaggregation of Revenue [Line Items]
Disaggregated revenue	18,491	95,695
Unique Configuration | High School Park and Recreation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	3,053	18,667
Unique Configuration | Transportation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	10,095	30,140
Unique Configuration | International
Disaggregation of Revenue [Line Items]
Disaggregated revenue	6,798	33,790
Limited Configuration
Disaggregation of Revenue [Line Items]
Disaggregated revenue	57,688	208,060
Limited Configuration | Commercial
Disaggregation of Revenue [Line Items]
Disaggregated revenue	27,353	82,605
Limited Configuration | Live Events
Disaggregation of Revenue [Line Items]
Disaggregated revenue	5,958	23,243
Limited Configuration | High School Park and Recreation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	11,036	53,964
Limited Configuration | Transportation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	4,692	18,970
Limited Configuration | International
Disaggregation of Revenue [Line Items]
Disaggregated revenue	8,649	29,278
Service and Other
Disaggregation of Revenue [Line Items]
Disaggregated revenue	13,002	35,180
Service and Other | Commercial
Disaggregation of Revenue [Line Items]
Disaggregated revenue	3,864	10,775
Service and Other | Live Events
Disaggregation of Revenue [Line Items]
Disaggregated revenue	5,546	15,628
Service and Other | High School Park and Recreation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	709	1,867
Service and Other | Transportation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	603	1,514
Service and Other | International
Disaggregation of Revenue [Line Items]
Disaggregated revenue	$ 2,280	$ 5,396

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

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