Long-term Debt, Percentage Bearing Fixed Interest, Fair Value Amount

No definition available.

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Data Type:	xbrli:monetaryItemType
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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of decrease in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
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- Definition

The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of net unrealized gain (loss) related to the change in fair value of foreign currency exchange rate derivatives designated as cash flow hedging instruments. Recorded in accumulated other comprehensive income to the extent that the cash flow hedge is determined to be effective.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of unrealized gain (loss) related to the increase or decrease in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective.

+ References

+ Details

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Balance Type:	credit
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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Financial Instruments and Risk Management - Narrative (Details)	1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2017 USD ($)	Jun. 30, 2017 USD ($) derivative_instrument	Jun. 30, 2017 USD ($) derivative_instrument	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Aug. 31, 2015	Jun. 01, 2015 USD ($)
Derivative [Line Items]
Unrecognized pre-tax loss		$ 1,600,000		$ 9,700,000
Unrealized pre-tax gain			$ (4,300,000)	(1,100,000)
Portion or pre-tax gain included in AOCI expected to be included in earnings		4,100,000	4,100,000
Line of Credit \| Senior Secured Term Loan B Facility, net of discount, due 2022
Derivative [Line Items]
Face amount of debt		400,000,000.0	400,000,000.0
Estimate of Fair Value
Derivative [Line Items]
Fair market value of fixed rate long-term debt		0	0	$ 0
Reported Value Measurement
Derivative [Line Items]
Fair market value of fixed rate long-term debt		600,000,000	600,000,000
Senior Secured Term Loan B Facility, Due 2022 \| Senior Secured Term Loan B Facility, net of discount, due 2022
Derivative [Line Items]
Face amount of debt							$ 400,000,000.0
Senior Secured Term Loan B Facility, Due 2022 \| Senior Secured Term Loan B Facility, net of discount, due 2022 \| Interest Rate Swap
Derivative [Line Items]
Variable rate debt hedged		$ 200,000,000	$ 200,000,000		$ 200,000,000
Fixed interest rate		2.034%	2.034%		2.22%	2.22%
Derivative, Loss on Derivative	$ 1,700,000
Designated as Hedging Instrument \| Cash Flow Hedging \| Foreign Exchange Forward
Derivative [Line Items]
Number of open contracts \| derivative_instrument		64,000,000	64,000,000
Notional value		$ 127,300,000.0	$ 127,300,000.0
Not Designated as Hedging Instrument \| Foreign Exchange Forward
Derivative [Line Items]
Number of open contracts \| derivative_instrument		14,000,000	14,000,000
Notional value		$ 115,900,000.0	$ 115,900,000.0