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Summary of Significant Accounting Policies - Insurance (Details)	Mar. 31, 2021 USD ($)
Accounting Policies [Abstract]
Employer's liability claims subject to deductible per occurrence	$ 5,000,000.0
Worker's compensation claims per occurrence	5,000,000.0
Auto liability insurance claims deductible	15,000,000.0
General liability insurance claims deductible	15,000,000.0
Employee health care benefit plans subject to deductible per claimant	$ 800,000