Employee Benefit Plans - Multi-Employer Plan (Details)	12 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($) lb	Jun. 30, 2019 USD ($)
Multiemployer Plans [Line Items]
Employer contributions	$ 3,063,000	$ 3,054,000
Western Conference of Teamsters Pension Plan
Multiemployer Plans [Line Items]
Employer contributions	1,049,000	$ 1,685,000	$ 3,634,000
Multiemployer Plan, Pension, Significant, Employer Contribution under Collective-Bargaining Arrangement to All Participating Employer Contributions, Percentage		5.00%
Western Conference of Teamsters Pension Plan | Employee-related
Multiemployer Plans [Line Items]
Multiemployer plan, quarterly installments for withdrawal liability	190,507
All Other Plans
Multiemployer Plans [Line Items]
Employer contributions	$ 33,000	$ 34,000	$ 39,000
Program for Enhanced Early Retirement
Multiemployer Plans [Line Items]
Multiemployer Plan, Pension, Significant, Employer Contribution under Collective-Bargaining Arrangement to All Participating Employer Contributions, Percentage		6.50%
Employer contributions (hours) | lb		173