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Significant Accounting Policies - Narrative (Details) business in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 01, 2019 USD ($) | May 31, 2020 USD ($) business | May 31, 2020 USD ($) business reportingUnit | May 31, 2019 USD ($) | May 31, 2018 USD ($)
Accounting Policies [Line Items] |  |  |  |  |
Number of businesses helped | business |  | 1,000,000 | 1,000,000 |  |
Employee termination expense adjustment |  |  |  | $ (2,500,000) |
Long-lived asset impairment |  |  | $ 9,220,000 | 0 | $ 0
Restricted cash |  | $ 31,800,000 | 31,800,000 | 31,400,000 |
Inventory obsolescence reserve |  | 45,500,000 | 45,500,000 | 32,700,000 |
Long-lived asset impairment |  |  | $ 9,200,000 |  |
Number of reporting units | reportingUnit |  |  | 4 |  |
Impairment of intangible assets |  |  | $ 0 | 0 | 0
Operating lease right-of-use assets, net |  | 159,967,000 | 159,967,000 |  |
Operating lease liabilities |  | 165,726,000 | 165,726,000 |  |
2020 restructuring plan |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Employee termination expense adjustment |  | 24,500,000 |  |  |
Employee termination benefits | 2020 restructuring plan |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Payments for restructuring |  |  | 14,300,000 |  |
Restructuring liability |  | 10,200,000 | $ 10,200,000 |  |
Other Accumulated Comprehensive Income (Loss) |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
ASU 2018-02 reclassification | $ 2,000,000.0 |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Operating lease right-of-use assets, net | 168,000,000.0 |  |  |  |
Operating lease liabilities | $ 173,400,000 |  |  |  |
Uniforms in service |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Inventories useful life, maximum |  |  | 18 months |  |
Other rental items |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Inventories useful life, maximum |  |  | 60 months |  |
Inventories useful life, minimum |  |  | 8 months |  |
Minimum | Service contracts and other assets |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Service contracts and other assets useful lives (years) |  |  | 5 years |  |
Maximum | Service contracts and other assets |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Service contracts and other assets useful lives (years) |  |  | 10 years |  |
All Other |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Number of reporting units | reportingUnit |  |  | 2 |  |
Uniform rental and facility services | 2020 restructuring plan |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Employee termination expense adjustment |  | $ 20,200,000 |  |  |
G & K Services | Employee termination benefits |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Payments for restructuring |  |  | $ 700,000 | 3,800,000 | $ 15,200,000
Restructuring liability |  |  |  | $ 2,800,000 |
G & K Services | Service contracts |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Service contracts and other assets useful lives (years) |  |  | 15 years |  |

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