Restructuring Plans (Details)			3 Months Ended		12 Months Ended	44 Months Ended
	Feb. 21, 2017 USD ($)	Feb. 05, 2015	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)
Corporate Relocation Plan
Restructuring Cost and Reserve [Line Items]
Restructuring, number of positions affected		350
Restructuring charges			$ 3,400,000
Restructuring charges incurred to date			35,200,000			$ 35,200,000
DSD Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred to date			4,200,000			4,200,000
Employee-related | Corporate Relocation Plan
Restructuring Cost and Reserve [Line Items]
Payments						17,400,000
Employee-related | DSD Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges			1,000,000	$ 24,000
Payments			2,300,000
Facility Closing | Corporate Relocation Plan
Restructuring Cost and Reserve [Line Items]
Accelerated depreciation						2,300,000
Payments						7,000,000
Other Restructuring | Corporate Relocation Plan
Restructuring Cost and Reserve [Line Items]
Payments						7,400,000
Sale Leaseback Transaction, Rent Expense					$ 1,400,000
Other Restructuring | DSD Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges			200,000	$ 100,000
Payments			1,900,000
Pension withdrawal liability | Corporate Relocation Plan
Restructuring Cost and Reserve [Line Items]
Payments						3,400,000
Pension withdrawal liability | DSD Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Payments			3,400,000
Expected cost remaining			800,000			800,000
Maximum | DSD Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring and related costs	$ 4,900,000
Maximum | Employee-related | DSD Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring and related costs	2,700,000
Maximum | Other Restructuring | DSD Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring and related costs	$ 2,200,000
WCTPP [Member] | Employee-related
Restructuring Cost and Reserve [Line Items]
Withdrawal obligation			3,200,000			3,200,000
WCTPP [Member] | Employee-related | Corporate Relocation Plan
Restructuring Cost and Reserve [Line Items]
Multiemployer Plans, Withdrawal Obligation, Amount Paid			$ 200,000			$ 200,000