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Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Goodwill and other Intangible Asset Impairment	$ 15,600	$ 14,600		$ 30,227
Goodwill, Gross			$ 1,088,487	1,081,452	$ 1,084,064
Goodwill, Accumulated Impairment Loss			810,872	810,872	784,053
Goodwill			277,615	270,580	300,011
Goodwill, Period Increase (Decrease)			7,035	(2,612)
Metal Cutting [Member]
Goodwill, Gross			455,276	448,241	450,853
Goodwill, Accumulated Impairment Loss			(177,661)	(177,661)	(150,842)
Goodwill			277,615	270,580	300,011
Goodwill, Period Increase (Decrease)			7,035	(2,612)
Infrastructure [Member]
Goodwill, Gross			633,211	633,211	633,211
Goodwill, Accumulated Impairment Loss			(633,211)	(633,211)	(633,211)
Goodwill			0	0	$ 0
Goodwill, Period Increase (Decrease)			$ 0	$ 0

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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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+ References

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Amount before 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

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-Paragraph 1
-Subparagraph (a)
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+ References

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