Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Oct. 03, 2021	Dec. 31, 2020
Assets:
Money market instruments	$ 3,616	$ 2,464
Financial assets at fair value	781,907
Corporate Bonds
Assets:
Financial assets at fair value	555,992
Treasury Bills
Assets:
Financial assets at fair value	114,998
Asset-Backed Securities
Assets:
Financial assets at fair value	83,896
Agency Bonds
Assets:
Financial assets at fair value	18,966
Sovereign Bonds
Assets:
Financial assets at fair value	1,089
Municipal Bonds
Assets:
Financial assets at fair value	6,966
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Assets:
Money market instruments	3,616
Economic hedge forward contracts	0
Liabilities:
Economic hedge forward contracts	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Corporate Bonds
Assets:
Financial assets at fair value	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Treasury Bills
Assets:
Financial assets at fair value	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Asset-Backed Securities
Assets:
Financial assets at fair value	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Agency Bonds
Assets:
Financial assets at fair value	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Sovereign Bonds
Assets:
Financial assets at fair value	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Municipal Bonds
Assets:
Financial assets at fair value	0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets:
Money market instruments	0
Economic hedge forward contracts	129
Liabilities:
Economic hedge forward contracts	88
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Corporate Bonds
Assets:
Financial assets at fair value	555,992
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Treasury Bills
Assets:
Financial assets at fair value	114,998
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Asset-Backed Securities
Assets:
Financial assets at fair value	83,896
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Agency Bonds
Assets:
Financial assets at fair value	18,966
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Sovereign Bonds
Assets:
Financial assets at fair value	1,089
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Municipal Bonds
Assets:
Financial assets at fair value	6,966
Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets:
Money market instruments	0
Economic hedge forward contracts	0
Liabilities:
Economic hedge forward contracts	0
Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate Bonds
Assets:
Financial assets at fair value	0
Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Treasury Bills
Assets:
Financial assets at fair value	0
Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Asset-Backed Securities
Assets:
Financial assets at fair value	0
Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Agency Bonds
Assets:
Financial assets at fair value	0
Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Sovereign Bonds
Assets:
Financial assets at fair value	0
Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Municipal Bonds
Assets:
Financial assets at fair value	$ 0