Commitments and Contingencies (Details) ft² in Thousands, $ in Millions		3 Months Ended
	Jan. 16, 2015 USD ($) ft²	Mar. 31, 2017 ft²	Sep. 30, 2016 ft²	Jun. 15, 2016 USD ($)
Schedule Of Operating Leases Square Footage [Line Items]
Lease square footage | ft²	222		167
Annual rent expense	$ 2.9
Scenario, Forecast [Member]
Schedule Of Operating Leases Square Footage [Line Items]
Lease square footage | ft²		55
Merger of AmSurg and Envision into New Amethyst [Member]
Schedule Of Operating Leases Square Footage [Line Items]
Potential merger termination fee				$ 180.0
Potential merger termination reimbursement of expenses				$ 15.0