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Restructuring Charges - Narrative (Details) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 23, 2019 office | Dec. 29, 2018 | Apr. 05, 2020 USD ($) | Dec. 29, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 30, 2018 USD ($) | Dec. 30, 2018 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of employees |  | 200 |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | $ 20,500
Severance costs |  |  |  |  |  | $ 10,800 |
Asset impairment charges |  |  |  |  |  | 8,600 |
Other restructuring costs |  |  |  |  |  | $ 1,100 |
Estimated restructuring costs remaining |  |  | $ 12,000 |  |  |  |
Restructuring Charges |  |  | (1,118) |  | $ 0 |  |
Workforce Reduction |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Estimated restructuring costs remaining |  |  | 10,800 |  |  |  |
2018 and 2019 Restructuring Plan [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Reserve |  |  |  | $ 8,400 |  |  |
2019 Restructuring Plan [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of employees | 105 |  |  |  |  |  |
Severance costs |  |  |  | 8,800 |  |  |
Estimated restructuring costs remaining |  |  | 9,000 |  |  |  |
Expected savings from restructuring |  |  | 6,000 |  |  |  |
Restructuring Charges |  |  | 409 | 9,000 |  |  |
Restructuring Reserve |  |  | 7,383 | 8,773 |  |  |
2019 Restructuring Plan [Member] | Workforce Reduction |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number Of Office Leases | office | 2 |  |  |  |  |  |
Restructuring Charges |  |  | 409 |  |  |  |
Restructuring Reserve |  |  | $ 7,244 | 8,634 |  |  |
2019 Restructuring Plan [Member] | Facility Closing [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Charges |  |  |  | $ 200 |  |  |

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