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Goodwill (Details) $ in Thousands	9 Months Ended
	Jan. 28, 2017 USD ($)
Goodwill
Balance as of April 30, 2016	$ 8,116
Acquisition, net of cash required	19
Foreign currency translation	(269)
Balance as of January 28, 2017	7,866
Live Events
Goodwill
Balance as of April 30, 2016	2,304
Acquisition, net of cash required	0
Foreign currency translation	(16)
Balance as of January 28, 2017	2,288
Commerical
Goodwill
Balance as of April 30, 2016	3,350
Acquisition, net of cash required	19
Foreign currency translation	(108)
Balance as of January 28, 2017	3,261
Transportation
Goodwill
Balance as of April 30, 2016	75
Acquisition, net of cash required	0
Foreign currency translation	(16)
Balance as of January 28, 2017	59
International
Goodwill
Balance as of April 30, 2016	2,387
Acquisition, net of cash required	0
Foreign currency translation	(129)
Balance as of January 28, 2017	$ 2,258

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e961-128460

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-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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- Definition

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