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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Oct. 27, 2018	Oct. 27, 2018
Disaggregation of Revenue [Line Items]
Disaggregated revenue	$ 172,692	$ 326,880
Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	83,907	151,058
Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	88,785	175,822
Commercial
Disaggregation of Revenue [Line Items]
Disaggregated revenue	46,069	76,638
Commercial | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	31,896	56,479
Commercial | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	14,173	20,159
Live Events
Disaggregation of Revenue [Line Items]
Disaggregated revenue	55,099	104,571
Live Events | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	12,558	19,360
Live Events | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	42,541	85,211
High School Park and Recreation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	31,580	59,700
High School Park and Recreation | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	22,060	39,058
High School Park and Recreation | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	9,520	20,642
Transportation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	18,077	35,234
Transportation | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	7,267	14,499
Transportation | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	10,810	20,735
International
Disaggregation of Revenue [Line Items]
Disaggregated revenue	21,867	50,737
International | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	10,126	21,662
International | Transferred over Time
Disaggregation of Revenue [Line Items]
Disaggregated revenue	11,741	29,075
Unique Configuration
Disaggregation of Revenue [Line Items]
Disaggregated revenue	77,583	154,330
Unique Configuration | Commercial
Disaggregation of Revenue [Line Items]
Disaggregated revenue	11,426	14,475
Unique Configuration | Live Events
Disaggregation of Revenue [Line Items]
Disaggregated revenue	38,283	77,204
Unique Configuration | High School Park and Recreation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	6,671	15,614
Unique Configuration | Transportation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	10,427	20,045
Unique Configuration | International
Disaggregation of Revenue [Line Items]
Disaggregated revenue	10,776	26,992
Limited Configuration
Disaggregation of Revenue [Line Items]
Disaggregated revenue	84,279	150,372
Limited Configuration | Commercial
Disaggregation of Revenue [Line Items]
Disaggregated revenue	31,385	55,252
Limited Configuration | Live Events
Disaggregation of Revenue [Line Items]
Disaggregated revenue	11,467	17,285
Limited Configuration | High School Park and Recreation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	24,381	42,928
Limited Configuration | Transportation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	7,195	14,278
Limited Configuration | International
Disaggregation of Revenue [Line Items]
Disaggregated revenue	9,851	20,629
Service and Other
Disaggregation of Revenue [Line Items]
Disaggregated revenue	10,830	22,178
Service and Other | Commercial
Disaggregation of Revenue [Line Items]
Disaggregated revenue	3,258	6,911
Service and Other | Live Events
Disaggregation of Revenue [Line Items]
Disaggregated revenue	5,349	10,082
Service and Other | High School Park and Recreation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	528	1,158
Service and Other | Transportation
Disaggregation of Revenue [Line Items]
Disaggregated revenue	455	911
Service and Other | International
Disaggregation of Revenue [Line Items]
Disaggregated revenue	$ 1,240	$ 3,116

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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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