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Goodwill (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Nov. 01, 2014
Goodwill
Balance as of April 26, 2014	$ 4,558
Disposal of automated rigging systems for theatre applications	(22)
Acquisition, net of cash required	1,099
Foreign currency translation	(194)
Balance as of November 1, 2014	5,441
Live Events
Goodwill
Balance as of April 26, 2014	2,381
Disposal of automated rigging systems for theatre applications	(22)
Acquisition, net of cash required	0
Foreign currency translation	(6)
Balance as of November 1, 2014	2,353
Commerical
Goodwill
Balance as of April 26, 2014	723
Disposal of automated rigging systems for theatre applications	0
Acquisition, net of cash required	0
Foreign currency translation	0
Balance as of November 1, 2014	723
Transportation
Goodwill
Balance as of April 26, 2014	129
Disposal of automated rigging systems for theatre applications	0
Acquisition, net of cash required	0
Foreign currency translation	(7)
Balance as of November 1, 2014	122
International
Goodwill
Balance as of April 26, 2014	1,325
Disposal of automated rigging systems for theatre applications	0
Acquisition, net of cash required	1,099
Foreign currency translation	(181)
Balance as of November 1, 2014	$ 2,243

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

-URI http://asc.fasb.org/extlink&oid=14024403&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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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ 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=14024403&loc=d3e13816-109267

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- Definition

Amount of increase (decrease) from foreign currency translation adjustments 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

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- Definition

Amount of divestiture 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 (d)

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

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