Consolidated Statements Of Operations And Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
REVENUES:
Service revenues	$ 468,384	$ 488,426	$ 762,438	$ 767,082
OPERATING EXPENSES:
Costs of revenues	421,026	416,601	893,401	884,335
Selling, general and administrative	185,458	169,098	404,517	381,193
Total operating expenses	606,484	585,699	1,297,918	1,265,528
Other income (expense), net	2,269	1,028	11,275	3,259
Interest expense on borrowings	(22,833)	(24,560)	(65,214)	(67,102)
Loss from continuing operations before income taxes (benefit)	(158,664)	(120,805)	(589,419)	(562,289)
Income taxes (benefit)	(38,885)	122,120	(149,906)	(43,234)
Net loss from continuing operations	(119,779)	(242,925)	(439,513)	(519,055)
Net loss from discontinued operations, net of tax benefits of $1,962, $1,422, $4,731 and $6,094	(6,675)	(2,720)	(15,887)	(10,723)
Net loss	$ (126,454)	$ (245,645)	$ (455,400)	$ (529,778)
BASIC AND DILUTED LOSS PER SHARE:
Continuing operations (in usd per share)	$ (0.58)	$ (1.16)	$ (2.13)	$ (2.49)
Discontinued operations (in usd per share)	(0.04)	(0.02)	(0.08)	(0.05)
Consolidated (in usd per share)	(0.62)	(1.18)	(2.21)	(2.54)
DIVIDENDS PAID PER SHARE (in usd per share)	$ 0.25	$ 0.24	$ 0.75	$ 0.72
COMPREHENSIVE LOSS:
Net loss	$ (126,454)	$ (245,645)	$ (455,400)	$ (529,778)
Unrealized gains on securities, net of taxes	3	0	3	1
Change in foreign currency translation adjustments	1,235	4,848	(3,342)	5,924
Other comprehensive income (loss)	1,238	4,848	(3,339)	5,925
Comprehensive loss	(125,216)	(240,797)	(458,739)	(523,853)
Service revenues
REVENUES:
Service revenues	373,659	388,771	627,786	641,389
Royalty, product and other revenues
REVENUES:
Service revenues	$ 94,725	$ 99,655	$ 134,652	$ 125,693