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Accumulated Other Comprehensive Income (loss) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
May 31, 2020 | May 31, 2019 | May 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | $ 1,408,605 | $ 1,633,538 | $ 1,438,700
Deferred taxes | (23,403) | (19,068) | 3,773
Ending Balance | 1,264,663 | 1,408,605 | 1,633,538
Foreign Currency Translation Adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (370,495) | (300,013) | (308,415)
Other comprehensive income (loss) | (71,820) | (73,660) | 10,989
Deferred taxes | 1,583 | 3,178 | (2,587)
Ending Balance | (440,732) | (370,495) | (300,013)
Pension And Other Postretirement Benefit Liability Adjustments, Net of Tax |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (211,645) | (157,495) | (166,724)
Other comprehensive income (loss) | (86,347) | (70,785) | 11,375
Deferred taxes | 20,275 | 16,635 | (2,146)
Ending Balance | (277,717) | (211,645) | (157,495)
Unrealized Gain (Loss) On Derivatives, Net of Tax |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | 4,379 | (131) | 16
Other comprehensive income (loss) | (6,315) | 4,713 | (359)
Deferred taxes | 1,865 | (203) | 212
Ending Balance | (71) | 4,379 | (131)
Unrealized Gain (Loss) On Securities, Net of Tax |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | 133 | (1,409) | 1,137
Reclassification adjustments for gains (losses) included in net income, net of taxes of $151, $591, $401 in 2020, 2019 and 2018 |  | 1,777 | (1,244)
Other comprehensive income (loss) | 1,210 | 307 | (2,050)
Deferred taxes | (320) | (542) | 748
Ending Balance | 1,023 | 133 | (1,409)
Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (577,628) | (459,048) | (473,986)
Reclassification adjustments for gains (losses) included in net income, net of taxes of $151, $591, $401 in 2020, 2019 and 2018 |  | 1,777 | (1,244)
Other comprehensive income (loss) | (163,272) | (139,425) | 19,955
Deferred taxes | 23,403 | 19,068 | (3,773)
Ending Balance | $ (717,497) | $ (577,628) | $ (459,048)

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