VPT Loans - MPTC Loan (Details)	2 Months Ended	3 Months Ended	12 Months Ended
	Nov. 23, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)	Oct. 02, 2015 USD ($)	Sep. 26, 2014 USD ($)	May 31, 2015 USD ($) installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payments to Acquire Notes Receivable			$ 21,700,000	$ 23,700,000	$ 5,500,000
Notes Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
LT Notes		$ 59,200,000	59,200,000	30,900,000
MPTC loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled receivables		9,200,000	$ 9,200,000	28,600,000
MPTC loan | Notes Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commitment						$ 35,000,000.0
Payments to Acquire Notes Receivable		$ 11,400,000
Total number of installments | installment						3
State rate (as a percent)		12.00%	12.00%
LT Notes		$ 40,700,000	$ 40,700,000	$ 12,200,000
MPTC loan | Roll Over Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross amount						$ 12,200,000
Accrued interest						2,200,000.0
LT Notes						$ 10,000,000
Reclassification From Long-Term Accounts Receivable In June 2016 | MPTC loan | Notes Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
State rate (as a percent)		15.00%	15.00%
LT Notes		$ 17,100,000	$ 17,100,000
Subsequent Event | MPTC loan | Notes Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payments to Acquire Notes Receivable	$ 11,400,000