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Organization and Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
Payor
Customer
$ / shares
Jun. 30, 2019
USD ($)
Customer
Jun. 30, 2018
USD ($)
Jul. 01, 2019
USD ($)
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]          
Number of major customers comprising more than ten10 % of revenues | Customer   0 0    
Other-than-temporary impairments   $ 0 $ 0 $ 0  
CARES act of 2020, medicare payment amount   $ 29,700,000      
Revenue, practical expedient, remaining performance obligation, description   In accordance with ASU 2014-09, the Company has elected not to disclose the aggregate amount of the transaction price allocated to remaining performance obligations for its contracts that are one year or less, as the revenue is expected to be recognized within the next year. Furthermore, the Company has elected not to disclose the aggregate amount of the transaction price allocated to remaining performance obligations for its agreements wherein the Company’s right to payment is in an amount that directly corresponds with the value of Company’s performance to date. However, periodically the Company enters into arrangements with customers to provide diagnostic testing and/or pharmaceutical and clinical services that may have terms longer than one year and include multiple performance obligations.      
Revenue, practical expedient, remaining performance obligation   true      
Revenue, practical expedient, initial application and transition, nondisclosure of transaction price allocation to remaining performance obligation   true      
Revenue, remaining performance obligation $ 2,700,000 $ 2,700,000      
Revenue decrease performance obligation 400,000 $ 9,900,000      
Change in earnings (loss) per share | $ / shares   $ (0.10)      
Accrued liabilities 75,900,000 $ 75,900,000 $ 78,900,000    
Capitalized costs incurred to obtain or fulfill contract 0 $ 0      
Revenue practical expedient, incremental cost of obtaining contract   true      
Revenue, performance obligation, description of payment terms   This practical expedient has been elected because the Company collects very little cash from customers under payment terms and vast majority of payments terms have a payback period of less than one year.      
CARES act of 2020, provider fund amount   $ 14,600,000      
Operating lease liability 70,400,000 70,400,000      
Operating lease right-of-use assets 66,000,000.0 66,000,000.0      
Current maturities of operating lease liabilities 13,500,000 13,500,000      
Noncurrent operating lease liabilities 56,900,000 56,900,000      
ASU 2016-02 [Member]          
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]          
Operating lease liability 78,800,000 78,800,000     $ 78,800,000
Operating lease right-of-use assets $ 74,500,000 $ 74,500,000     74,500,000
Current maturities of operating lease liabilities         65,700,000
Noncurrent operating lease liabilities         $ 74,500,000
Correction of Error in Current Period [Member]          
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]          
Change in earnings (loss) per share | $ / shares $ (0.05) $ (0.05)      
Minimum [Member] | Equipment [Member]          
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]          
Estimated useful lives, in years   5 years      
Minimum [Member] | Leasehold Improvements [Member]          
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]          
Estimated useful lives, in years   3 years      
Maximum [Member] | Equipment [Member]          
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]          
Estimated useful lives, in years   7 years      
Maximum [Member] | Leasehold Improvements [Member]          
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]          
Estimated useful lives, in years   7 years      
Medicare [Member]          
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]          
Number of payor that receives greater than 10% of its revenues | Payor   1      
Percentage of revenues from Medicare   15.00% 14.00% 17.00%  
Accrued liabilities $ 4,700,000 $ 4,700,000      
Medicare [Member] | Minimum [Member]          
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]          
Percentage of revenues from Medicare   10.00%