Goodwill and Other Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Jun. 02, 2018	Mar. 03, 2018
Schedule of goodwill attributable to each business segment
Goodwill, Beginning	$ 180,956	$ 101,334
Goodwill acquired		84,162
Goodwill adjustments for purchase accounting	6,267	(5,859)
Foreign currency translation	(189)	1,319
Goodwill, Ending	187,034	180,956
Architectural Glass
Schedule of goodwill attributable to each business segment
Goodwill, Beginning	25,971	25,956
Goodwill acquired		0
Goodwill adjustments for purchase accounting	0	0
Foreign currency translation	4	15
Goodwill, Ending	25,975	25,971
Architectural Framing Systems
Schedule of goodwill attributable to each business segment
Goodwill, Beginning	143,308	63,701
Goodwill acquired		84,162
Goodwill adjustments for purchase accounting	6,267	(5,859)
Foreign currency translation	(193)	1,304
Goodwill, Ending	149,382	143,308
Architectural Services
Schedule of goodwill attributable to each business segment
Goodwill, Beginning	1,120	1,120
Goodwill acquired		0
Goodwill adjustments for purchase accounting	0	0
Foreign currency translation	0	0
Goodwill, Ending	1,120	1,120
Large-Scale Optical
Schedule of goodwill attributable to each business segment
Goodwill, Beginning	10,557	10,557
Goodwill acquired		0
Goodwill adjustments for purchase accounting	0	0
Foreign currency translation	0	0
Goodwill, Ending	$ 10,557	$ 10,557

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.

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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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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=84229725&loc=d3e961-128460

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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