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Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
May 31, 2018 | May 31, 2017 | May 31, 2016
AOCI, Net of Tax [Roll Forward] |  |  |
Beginning Balance | $ 2,302,793 | $ 1,842,659 | $ 1,932,455
Other comprehensive income before reclassifications | 20,305 | 20,769 |
Amounts reclassified from accumulated other comprehensive income (loss) | (933) | 1,076 |
Other comprehensive income (loss), net of tax expense (benefit) of $690, $19,118 and ($9,813), respectively | 19,372 | 21,845 | (16,403)
Ending Balance | 3,016,526 | 2,302,793 | 1,842,659
Foreign Currency |  |  |
AOCI, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (12,726) | (2,474) |
Other comprehensive income before reclassifications | 19,276 | (10,252) |
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0 |
Other comprehensive income (loss), net of tax expense (benefit) of $690, $19,118 and ($9,813), respectively | 19,276 | (10,252) |
Ending Balance | 6,550 | (12,726) | (2,474)
Unrealized (Loss) Gain on Cash Flow Hedges |  |  |
AOCI, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 11,382 | (20,830) |
Other comprehensive income before reclassifications | 0 | 31,136 |
Amounts reclassified from accumulated other comprehensive income (loss) | (933) | 1,076 |
Other comprehensive income (loss), net of tax expense (benefit) of $690, $19,118 and ($9,813), respectively | (933) | 32,212 |
Ending Balance | 10,449 | 11,382 | (20,830)
Other |  |  |
AOCI, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (1,685) | (1,570) |
Other comprehensive income before reclassifications | 1,029 | (115) |
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0 |
Other comprehensive income (loss), net of tax expense (benefit) of $690, $19,118 and ($9,813), respectively | 1,029 | (115) |
Ending Balance | (656) | (1,685) | (1,570)
Other Accumulated Comprehensive Income (Loss) |  |  |
AOCI, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (3,029) | (24,874) | (8,471)
Ending Balance | $ 16,343 | $ (3,029) | $ (24,874)

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- Definition Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109228884&loc=d3e1436-108581 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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