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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Thousands | 12 Months Ended
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May 31, 2019 | May 31, 2018 | May 31, 2017
Allowance for Doubtful Accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | $ 33,510 | $ 20,525 | $ 19,103
Additions | 10,761 | 13,358 | 6,446
Deductions | 6,462 | 373 | 5,024
Balance at End of Year | 37,809 | 33,510 | 20,525
Reserve for Obsolete Inventory |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | 37,043 | 38,305 | 32,716
Additions | 2,346 | 1,335 | 10,049
Deductions | 6,711 | 2,597 | 4,460
Balance at End of Year | $ 32,678 | $ 37,043 | $ 38,305

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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