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Summary of Trade Accounts Receivable Net of Allowances and Net Contract Assets (Liabilities) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 30, 2020 | Nov. 30, 2020 | Aug. 31, 2020 | May 31, 2020
Disaggregation Of Revenue [Line Items] |  |  |  |
Trade accounts receivable, less allowances | $ 1,081,841 | $ 1,081,841 | $ 1,159,130 | $ 1,137,957
Contract assets | 27,154 | 27,154 | 36,292 | 25,249
Contract liabilities - short-term | (28,310) | (28,310) | (25,605) | (25,288)
Net Contract Assets (Liabilities) | (1,156) | (1,156) | $ 10,687 | $ (39)
Change in Contract with Customer, Asset and Liability [Abstract] |  |  |  |
Change in trade accounts receivable, less allowance | (77,289) | (56,116) |  |
Change in contract assets | (9,138) | 1,905 |  |
Change in Net Contract Assets (Liabilities) | $ (11,843) | $ (1,117) |  |
Percentage of change in trade accounts receivable, less allowance | (6.70%) | (4.90%) |  |
Percentage of change in contract assets | (25.20%) | 7.50% |  |
Short-term |  |  |  |
Change in Contract with Customer, Asset and Liability [Abstract] |  |  |  |
Change in contract liabilities | $ (2,705) | $ (3,022) |  |
Percentage of change in contract liabilities | 10.60% | 12.00% |  |

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