SUPPLEMENTAL GUARANTOR AND NON-GUARANTOR CONDENSED CONSOLIDATING FINANCIAL STATEMENTS - Statement of Cash Flows (Details) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Condensed consolidating statements of cash flows
Net cash provided by (used in) operating activities	$ 1,013,188	$ 939,772
Cash flows from investing activities:
Purchases of property and equipment, net of proceeds from disposal	(385,540)	(413,934)
Acquisition and divestiture of businesses, net of cash acquired and cash held in divested business	(180,259)	(903,845)
Proceeds from divestiture of businesses, net of cash held in divested businesses	36,073	3,603
Investing cash flows to affiliates	0	0
Other investing activities, net	(49,704)	1,397
Net cash used in investing activities	(579,430)	(1,312,779)
Cash flows from financing activities:
Proceeds from bank borrowings and long-term debt	205,518	755,684
Repayments of bank borrowings and long-term debt	(115,089)	(40,706)
Payments for repurchases of ordinary shares	(259,658)	(331,690)
Net proceeds from issuance of ordinary shares	11,978	52,950
Financing cash flows from affiliates	0	0
Other financing activities, net	(47,302)	(49,742)
Net cash (used in) provided by financing activities	(204,553)	386,496
Effect of exchange rates on cash and cash equivalents	20,321	(7,703)
Net increase in cash and cash equivalents	249,526	5,786
Cash and cash equivalents, beginning of period	1,607,570	1,628,408
Cash and cash equivalents, end of period	1,857,096	1,634,194
Reportable legal entities | Parent
Condensed consolidating statements of cash flows
Net cash provided by (used in) operating activities	520,709	343,182
Cash flows from investing activities:
Purchases of property and equipment, net of proceeds from disposal	0	0
Acquisition and divestiture of businesses, net of cash acquired and cash held in divested business	0	0
Proceeds from divestiture of businesses, net of cash held in divested businesses	0	0
Investing cash flows to affiliates	(840,082)	(1,099,775)
Other investing activities, net	(61,213)	(2,046)
Net cash used in investing activities	(901,295)	(1,101,821)
Cash flows from financing activities:
Proceeds from bank borrowings and long-term debt	204,916	695,309
Repayments of bank borrowings and long-term debt	(106,547)	(35,638)
Payments for repurchases of ordinary shares	(259,658)	(331,690)
Net proceeds from issuance of ordinary shares	11,978	52,950
Financing cash flows from affiliates	790,398	632,750
Other financing activities, net	30,000	0
Net cash (used in) provided by financing activities	671,087	1,013,681
Effect of exchange rates on cash and cash equivalents	(81,563)	4,101
Net increase in cash and cash equivalents	208,938	259,143
Cash and cash equivalents, beginning of period	734,869	608,971
Cash and cash equivalents, end of period	943,807	868,114
Reportable legal entities | Guarantor Subsidiaries
Condensed consolidating statements of cash flows
Net cash provided by (used in) operating activities	(354,918)	(93,746)
Cash flows from investing activities:
Purchases of property and equipment, net of proceeds from disposal	(134,755)	(128,011)
Acquisition and divestiture of businesses, net of cash acquired and cash held in divested business	(73,469)	(809,233)
Proceeds from divestiture of businesses, net of cash held in divested businesses	20,500	0
Investing cash flows to affiliates	(3,334,220)	(923,812)
Other investing activities, net	(7,823)	(23,270)
Net cash used in investing activities	(3,529,767)	(1,884,326)
Cash flows from financing activities:
Proceeds from bank borrowings and long-term debt	0	0
Repayments of bank borrowings and long-term debt	(4,460)	(1,333)
Payments for repurchases of ordinary shares	0	0
Net proceeds from issuance of ordinary shares	0	0
Financing cash flows from affiliates	3,813,276	1,996,352
Other financing activities, net	(11,347)	0
Net cash (used in) provided by financing activities	3,797,469	1,995,019
Effect of exchange rates on cash and cash equivalents	2,713	2,143
Net increase in cash and cash equivalents	(84,503)	19,090
Cash and cash equivalents, beginning of period	148,201	168,272
Cash and cash equivalents, end of period	63,698	187,362
Reportable legal entities | Non-Guarantor Subsidiaries
Condensed consolidating statements of cash flows
Net cash provided by (used in) operating activities	847,430	690,336
Cash flows from investing activities:
Purchases of property and equipment, net of proceeds from disposal	(250,812)	(285,928)
Acquisition and divestiture of businesses, net of cash acquired and cash held in divested business	(106,790)	(94,612)
Proceeds from divestiture of businesses, net of cash held in divested businesses	15,573	3,603
Investing cash flows to affiliates	(532,400)	(1,087,520)
Other investing activities, net	19,332	26,713
Net cash used in investing activities	(855,097)	(1,437,744)
Cash flows from financing activities:
Proceeds from bank borrowings and long-term debt	602	60,375
Repayments of bank borrowings and long-term debt	(4,082)	(3,735)
Payments for repurchases of ordinary shares	0	0
Net proceeds from issuance of ordinary shares	0	0
Financing cash flows from affiliates	103,022	482,010
Other financing activities, net	(65,955)	(49,742)
Net cash (used in) provided by financing activities	33,587	488,908
Effect of exchange rates on cash and cash equivalents	99,171	(13,947)
Net increase in cash and cash equivalents	125,091	(272,447)
Cash and cash equivalents, beginning of period	724,500	851,165
Cash and cash equivalents, end of period	849,591	578,718
Eliminations
Condensed consolidating statements of cash flows
Net cash provided by (used in) operating activities	(33)	0
Cash flows from investing activities:
Purchases of property and equipment, net of proceeds from disposal	27	5
Acquisition and divestiture of businesses, net of cash acquired and cash held in divested business	0	0
Proceeds from divestiture of businesses, net of cash held in divested businesses	0	0
Investing cash flows to affiliates	4,706,702	3,111,107
Other investing activities, net	0	0
Net cash used in investing activities	4,706,729	3,111,112
Cash flows from financing activities:
Proceeds from bank borrowings and long-term debt	0	0
Repayments of bank borrowings and long-term debt	0	0
Payments for repurchases of ordinary shares	0	0
Net proceeds from issuance of ordinary shares	0	0
Financing cash flows from affiliates	(4,706,696)	(3,111,112)
Other financing activities, net	0	0
Net cash (used in) provided by financing activities	(4,706,696)	(3,111,112)
Effect of exchange rates on cash and cash equivalents	0	0
Net increase in cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	$ 0	$ 0