Consolidated Statements of Comprehensive Loss (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Statement of Comprehensive Income [Abstract]
Net loss	$ (57,874)	$ (62,694)	$ (144,838)	$ (87,531)
Other comprehensive income (loss):
Net foreign currency translation adjustments	(32,628)	23,186	(52,428)	19,369
Net change in defined benefit pension plan, net of income tax	348	(2,169)	1,046	(6,722)
Net change in cash flow hedges	0	0	0	(169)
Comprehensive loss	(90,154)	(41,677)	(196,220)	(75,053)
Comprehensive income (loss) attributable to:
Controlling interest	(91,464)	(35,437)	(197,914)	(71,627)
Non-controlling interest	1,310	(6,240)	1,694	(3,426)
Comprehensive loss	$ (90,154)	$ (41,677)	$ (196,220)	$ (75,053)