Commitments and Contingencies - Additional Information (Detail)	Jun. 29, 2019 USD ($)
Current Investments | Collateral Pledged [Member]
Commitments and Contingencies Disclosure [Line Items]
Investments providing collateral for letters of credit to guarantee insurance claims	$ 35,138,000
Non-Current Investments
Commitments and Contingencies Disclosure [Line Items]
Total non-current investments	80,682,000
Non-Current Investments | Collateral Pledged [Member]
Commitments and Contingencies Disclosure [Line Items]
Investments providing collateral for letters of credit to guarantee insurance claims	33,199,000
Revolving Credit Facility
Commitments and Contingencies Disclosure [Line Items]
Letters of credit outstanding	34,367,000
Guarantee Payment of Insurance Claims
Commitments and Contingencies Disclosure [Line Items]
Letters of credit outstanding	$ 61,503,000