SUPPLEMENTAL GUARANTOR AND NON-GUARANTOR CONDENSED CONSOLIDATING FINANCIAL STATEMENTS (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Condensed consolidating statements of cash flows
Net cash provided by (used in) operating activities	$ 794,034	$ 1,216,460	$ 1,115,430
Cash flows from investing activities:
Purchases of property and equipment, net of proceeds from disposal	(239,724)	(515,003)	(435,328)
Acquisition of businesses, net of cash acquired	(61,361)	(238,031)	(184,097)
Proceeds from divestitures of business, net of cash held in divested business	(5,493)	4,599	22,585
Other investing activities, net	64,362	(35,497)	(100,359)
Net cash provided by (used in) investing activities	(242,216)	(783,932)	(697,199)
Cash flows from financing activities:
Proceeds from bank borrowings and long-term debt	319,542	1,066,653	1,250,213
Repayments of bank borrowings and long-term debt and capital lease obligations	(344,156)	(537,580)	(391,859)
Payments for early repurchase of long-term debt		(544,840)	(1,000,000)
Payments for repurchases of ordinary shares	(415,945)	(475,314)	(322,040)
Proceeds from exercise of stock options	23,508	28,140	22,257
Other financing activities, net	(98,966)	52,149	101,851
Net cash provided by (used in) financing activities	(516,017)	(410,792)	(339,578)
Effect of exchange rates on cash and cash equivalents	(1,121)	(15,095)	(9,895)
Net increase (decrease) in cash and cash equivalents	34,680	6,641	68,758
Cash and cash equivalents, beginning of period	1,593,728	1,587,087	1,518,329
Cash and cash equivalents, end of period	1,628,408	1,593,728	1,587,087
Eliminations
Condensed consolidating statements of cash flows
Net cash provided by (used in) operating activities		551	(716)
Cash flows from investing activities:
Purchases of property and equipment, net of proceeds from disposal	(15)	(585)	530
Investing cash flows from (to) affiliates	2,809,552	2,265,515	(903,334)
Net cash provided by (used in) investing activities	2,809,537	2,264,930	(902,804)
Cash flows from financing activities:
Financing cash flows from (to) affiliates	(2,809,537)	(2,265,481)	903,520
Net cash provided by (used in) financing activities	(2,809,537)	(2,265,481)	903,520
Parent | Reportable legal entities
Condensed consolidating statements of cash flows
Net cash provided by (used in) operating activities	(73,356)	459,748	836,830
Cash flows from investing activities:
Investing cash flows from (to) affiliates	(1,703,983)	35,262	(1,228,773)
Other investing activities, net	(1,500)
Net cash provided by (used in) investing activities	(1,705,483)	35,262	(1,228,773)
Cash flows from financing activities:
Proceeds from bank borrowings and long-term debt	303,000	1,066,359	1,250,000
Repayments of bank borrowings and long-term debt and capital lease obligations	(335,500)	(492,034)	(379,399)
Payments for early repurchase of long-term debt		(503,423)	(756,855)
Payments for repurchases of ordinary shares	(415,945)	(475,314)	(322,040)
Proceeds from exercise of stock options	23,497	28,140	22,257
Financing cash flows from (to) affiliates	2,420,952	(277,594)	693,185
Net cash provided by (used in) financing activities	1,996,004	(653,866)	507,148
Effect of exchange rates on cash and cash equivalents	(246,908)	57,055	(23,942)
Net increase (decrease) in cash and cash equivalents	(29,743)	(101,801)	91,263
Cash and cash equivalents, beginning of period	638,714	740,515	649,252
Cash and cash equivalents, end of period	608,971	638,714	740,515
Guarantor Subsidiaries | Reportable legal entities
Condensed consolidating statements of cash flows
Net cash provided by (used in) operating activities	448,685	(543,426)	695,596
Cash flows from investing activities:
Purchases of property and equipment, net of proceeds from disposal	(85,876)	(222,197)	(137,921)
Acquisition of businesses, net of cash acquired	(20,589)	(61,587)	(20,150)
Investing cash flows from (to) affiliates	(2,284,175)	(510,168)	965,298
Other investing activities, net	(13,821)	(5,342)	6,412
Net cash provided by (used in) investing activities	(2,404,461)	(799,294)	813,639
Cash flows from financing activities:
Proceeds from bank borrowings and long-term debt	4,737	277	150
Repayments of bank borrowings and long-term debt and capital lease obligations	(3,127)	(525)	(3,875)
Payments for early repurchase of long-term debt		(41,417)	(243,145)
Financing cash flows from (to) affiliates	1,914,619	1,365,834	(1,213,350)
Net cash provided by (used in) financing activities	1,916,229	1,324,169	(1,460,220)
Effect of exchange rates on cash and cash equivalents	(2,643)	2,641	(1,801)
Net increase (decrease) in cash and cash equivalents	(42,190)	(15,910)	47,214
Cash and cash equivalents, beginning of period	210,462	226,372	179,158
Cash and cash equivalents, end of period	168,272	210,462	226,372
Non-Guarantor Subsidiaries | Reportable legal entities
Condensed consolidating statements of cash flows
Net cash provided by (used in) operating activities	418,705	1,299,587	(416,280)
Cash flows from investing activities:
Purchases of property and equipment, net of proceeds from disposal	(153,833)	(292,221)	(297,937)
Acquisition of businesses, net of cash acquired	(40,772)	(176,444)	(163,947)
Proceeds from divestitures of business, net of cash held in divested business	(5,493)	4,599	22,585
Investing cash flows from (to) affiliates	1,178,606	(1,790,609)	1,166,809
Other investing activities, net	79,683	(30,155)	(106,771)
Net cash provided by (used in) investing activities	1,058,191	(2,284,830)	620,739
Cash flows from financing activities:
Proceeds from bank borrowings and long-term debt	11,805	17	63
Repayments of bank borrowings and long-term debt and capital lease obligations	(5,529)	(45,021)	(8,585)
Proceeds from exercise of stock options	11
Financing cash flows from (to) affiliates	(1,526,034)	1,177,241	(383,355)
Other financing activities, net	(98,966)	52,149	101,851
Net cash provided by (used in) financing activities	(1,618,713)	1,184,386	(290,026)
Effect of exchange rates on cash and cash equivalents	248,430	(74,791)	15,848
Net increase (decrease) in cash and cash equivalents	106,613	124,352	(69,719)
Cash and cash equivalents, beginning of period	744,552	620,200	689,919
Cash and cash equivalents, end of period	$ 851,165	$ 744,552	$ 620,200