Debt and Credit Agreement - 2013 Credit Agreement (Details) - Wells Fargo Bank, National Association - USD ($)	Jan. 05, 2016	Sep. 30, 2013	Sep. 25, 2013
Letter of Credit
Debt Instrument [Line Items]
Revolving credit facility with a letter of credit sub limit	$ 10,000,000
Line of Credit | Letter of Credit
Debt Instrument [Line Items]
Revolving credit facility with a letter of credit sub limit		$ 10,000,000
Increases in to aggregate commitments (does not exceed $25 million)		$ 25,000,000
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility with a letter of credit sub limit	200,000,000		$ 75,000,000
Line of Credit | Secured Credit Facility
Debt Instrument [Line Items]
Revolving credit facility with a letter of credit sub limit	$ 400,000,000