Commitments and Contingencies (Details) $ in Millions		9 Months Ended
	Mar. 29, 2018 USD ($)	Jun. 30, 2018 USD ($) Bcf
Loss Contingencies [Line Items]
Self-insurance retention expense | $		$ 1.0
Civil Action, Dallas, Texas
Loss Contingencies [Line Items]
Damages sought | $	$ 1.0
Supply Commitment
Loss Contingencies [Line Items]
Purchase commitment contract term		1 year
Within one year | Supply Commitment
Loss Contingencies [Line Items]
Purchase commitment contract term		1 year
Purchase commitment amount within one year | Bcf		53,600
Within two to three years | Supply Commitment
Loss Contingencies [Line Items]
Purchase commitment amount within one year | Bcf		51,200
Minimum | Within two to three years | Supply Commitment
Loss Contingencies [Line Items]
Purchase commitment contract term		2 years
Maximum | Within two to three years | Supply Commitment
Loss Contingencies [Line Items]
Purchase commitment contract term		3 years