Debt, Capital Lease Obligations and Other Financing - Narrative (Details) - USD ($)	3 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Sep. 30, 2017
Debt Instrument [Line Items]
Amount of debt outstanding	$ 175,000,000		$ 283,000,000
Amount borrowed	216,314,000	$ 73,597,000
Long-term Debt, Fair Value	175,200,000		284,500,000
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum commitment	300,000,000.0
Amount credit facility may be further increased	500,000,000.0
Highest daily borrowings	193,000,000
Average daily borrowings	$ 134,200,000
Annual commitment fee	0.175%
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Amount of debt outstanding	$ 0		$ 108,000,000
Amount borrowed	215,500,000
Amount repaid	$ 323,500,000
5.20% Senior Notes | Senior Notes
Debt Instrument [Line Items]
Interest rate	5.20%		5.20%
Amount of debt outstanding	$ 175,000,000		$ 175,000,000