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Debt, Capital Lease Obligations and Other Financing - Narrative (Details) - USD ($)	3 Months Ended	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2018	Apr. 01, 2017	Sep. 30, 2017
Debt Instrument [Line Items]
Amount of debt outstanding	$ 175,000,000	$ 175,000,000		$ 283,000,000
Amount borrowed		504,616,000	$ 97,926,000
Debt, Fair Value	176,400,000	176,400,000		284,500,000
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum commitment	300,000,000.0	300,000,000.0
Amount credit facility may be further increased	$ 500,000,000.0	500,000,000.0
Highest daily borrowings		208,000,000
Average daily borrowings		108,500,000
Annual commitment fee	0.175%
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Amount of debt outstanding	$ 0	0		$ 108,000,000
Amount borrowed		503,500,000
Amount repaid		$ 611,500,000
5.20% Senior Notes | Senior Notes
Debt Instrument [Line Items]
Interest rate	5.20%	5.20%		5.20%
Amount of debt outstanding	$ 175,000,000	$ 175,000,000		$ 175,000,000

X

- Definition

Line of Credit Facility, Accordion Feature, Increase Limit

+ References

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Average amount borrowed under the credit facility during the period.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

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+ References

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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