Components of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands		12 Months Ended
		May 31, 2016	May 31, 2015	May 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		$ 840,049	$ 944,882	$ 872,237
Income taxes		(12,141)	8,866	(528)
Balance		919,846	840,049	944,882
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		(20,717)
Other comprehensive income (loss) before reclassifications		1,989
Balance		(18,728)	(20,717)
Pension Liability Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		(15,003)
Other comprehensive income (loss) before reclassifications		(3,667)
Reclassification adjustments to income	[1]	434
Income taxes		1,175
Balance		(17,061)	(15,003)
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		(14,984)
Other comprehensive income (loss) before reclassifications		7,283
Reclassification adjustments to income	[1]	28,241
Income taxes		(13,316)
Balance		7,224	(14,984)
Accumulated Other Comprehensive Loss, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		(50,704)	(3,581)	(12,036)
Balance		(28,565)	(50,704)	(3,581)
Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		749,112	850,812	830,822
Other comprehensive income (loss) before reclassifications		5,605
Reclassification adjustments to income	[1]	28,675
Income taxes		(12,141)
Balance		$ 793,371	$ 749,112	$ 850,812

[1] The statement of earnings classification of amounts reclassified to income for cash flow hedges is disclosed in "Note P - Derivative Instruments and Hedging Activities."