Borrowings (Details) € in Millions			3 Months Ended			9 Months Ended	12 Months Ended
	May 08, 2018	Nov. 04, 2016 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 EUR (€)	Dec. 30, 2017 EUR (€)	Jul. 01, 2017 USD ($)	Sep. 30, 2017 EUR (€)	Jun. 30, 2018 EUR (€)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Nov. 07, 2016 EUR (€)	Nov. 07, 2016 USD ($)	Aug. 01, 2016 EUR (€)
Debt [Line Items]
Repayments of debt		$ 50,000,000
Debt issuance cost related to repricing						$ 500,000
Additional sources of cash available									$ 27,900,000
Debt Instrument, Unused Borrowing Capacity, Amount									21,200,000
Rofin-Sinar
Debt [Line Items]
Lines of credit, maximum borrowing capacity												$ 30,000,000
Swing line, maximum borrowing capacity												$ 10,000,000
Credit Agreement November 7 2016
Debt [Line Items]
Senior Secured Net leverage ratio to increase revolving commitment or borrow incremental term loan											2.75	2.75
Senior secured net leverage ratio to maintain compliance on the loan each quarter end											3.50	3.50
Euro Member Countries, Euro
Debt [Line Items]
Domestic line of credit drawn | €											€ 10.0
Euro term loan
Debt [Line Items]
Debt Issuance Costs for revolving credit facility						$ 28,500,000
Amortization period of the debt issuance cost						7 years
Euro term loan | Base Rate
Debt [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%
Euro term loan | Eurodollar
Debt [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.25%
Debt Instrument, Gross Leverage Ratio	1.5
Euro term loan | Minimum | Eurodollar
Debt [Line Items]
Debt Instrument, Interest Rate, Stepdown	1.00%
Euro term loan | Maximum | Eurodollar
Debt [Line Items]
Debt Instrument, Interest Rate, Stepdown	2.00%
Euro term loan | Euro Member Countries, Euro
Debt [Line Items]
Forward contract purchased for the term loan | €								€ 373.3			€ 670.0		€ 670.0
Voluntary payment of principle | €				€ 60.0	€ 75.0		€ 150.0
Additional Euro currency rate											0.01	0.01
Euro currency rate range after 1st year											0.03	0.03
Euro currency rate range initially											0.035	0.035
Quarter principal payment requirement for Euro term loan											0.0025	0.0025
Euro term loan | Euro Member Countries, Euro | Minimum
Debt [Line Items]
Applicable margin for Eurocurrency rate loan											0.0375	0.0375
Euro term loan | Euro Member Countries, Euro | Maximum
Debt [Line Items]
Euro currency rate range after 1st year											0.035	0.035
Applicable margin for Eurocurrency rate loan											0.0425	0.0425
Revolving line of credit
Debt [Line Items]
Revolving facility to finance acquisition of Rofin								€ 10.0				$ 100,000,000
Revolving facility borrowing capapcity potential increase												150,000,000
Cash excess that requires the loan repayment												$ 10,000,000
Additional base rate											0.005	0.005
Base rate initially											0.025	0.025
Debt Issuance Costs for revolving credit facility						$ 2,300,000
debt issuance cost amortization period						5 years
Revolving line of credit | Minimum
Debt [Line Items]
Base rate range after 1st year											0.02	0.02
Applicable margin for base rate revolving loan											0.0275	0.0275
Commitment fee accrues range on unused portion of revolving loan											0.00375	0.00375
Revolving line of credit | Maximum
Debt [Line Items]
Base rate range after 1st year											0.025	0.025
Applicable margin for base rate revolving loan											0.0325	0.0325
Commitment fee accrues range on unused portion of revolving loan											0.005	0.005
Line of Credit, Foreign | Europe
Debt [Line Items]
Amounts drawn upon line of credit									6,100,000
Line of Credit, Foreign | JAPAN
Debt [Line Items]
Amounts drawn upon line of credit									600,000
O.R. Lasertechnologies GmbH
Debt [Line Items]
Aggregate principal of two term loans										$ 1,900,000
Aggregate principal of several term loans payment			$ (1,200,000)
Remaining aggregate principal of several term loans									$ (600,000)
Rofin-Sinar
Debt [Line Items]
Aggregate principal of two term loans												$ (15,300,000)
Aggregate amount of several lines of credit												$ (18,100,000)