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Restructuring (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2017 USD ($) employee	Sep. 30, 2016 USD ($) employee	Sep. 30, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 2,302	$ 0	$ 0
Restructuring charge	2,515	753
Payments	(269)	(754)
Reversals	0	(6)
Foreign currency fluctuation	56	7
Q1 2016 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charge		$ 700
Number of employees eliminated | employee		10
Q2 2016 Restructuring
Restructuring Cost and Reserve [Line Items]
Number of employees eliminated | employee		5
Q3 2017 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charge	2,500
Employee Termination Costs | Q1 2016 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0	$ 0	0
Restructuring charge	0	480
Payments	0	(481)
Reversals	0	(6)
Foreign currency fluctuation	0	7
Employee Termination Costs | Q2 2016 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0	0	0
Restructuring charge	0	78
Payments	0	(78)
Reversals	0	0
Foreign currency fluctuation	0	0
Employee Termination Costs | Q3 2017 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	2,109	0	0
Restructuring charge	2,258	0
Payments	(199)	0
Reversals	0	0
Foreign currency fluctuation	50	0
Other | Q1 2016 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0	0	0
Restructuring charge	0	195
Payments	0	(195)
Reversals	0	0
Foreign currency fluctuation	0	0
Other | Q3 2017 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	193	0	$ 0
Restructuring charge	257	0
Payments	(70)	0
Reversals	0	0
Foreign currency fluctuation	6	$ 0
Primarily France | Other | Q3 2017 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charge	$ 200
UNITED STATES | Q3 2017 Restructuring
Restructuring Cost and Reserve [Line Items]
Number of employees eliminated | employee	10
FRANCE | Q3 2017 Restructuring
Restructuring Cost and Reserve [Line Items]
Number of employees eliminated | employee	8

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 420
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Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ References

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