SUPPLEMENTAL GUARANTOR AND NON-GUARANTOR CONSOLIDATED FINANCIAL STATEMENTS (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Net cash provided by operating activities	$ 1,115,430	$ 804,268	$ 857,344
Cash flows from investing activities:
Purchases of property and equipment, net of proceeds from disposal	(435,328)	(388,004)	(393,869)
Acquisition of businesses, net of cash acquired	(184,097)	(92,257)	(16,966)
Proceeds from divestitures of operations, net	22,585	1,398	625
Other investing activities	(100,359)	(2,501)	(3,031)
Net cash used in investing activities	(697,199)	(481,364)	(413,241)
Cash flows from financing activities:
Proceeds from bank borrowings and long-term debt	1,250,213	2,833,704	3,471,494
Repayments of bank borrowings and long-term debt	(391,859)	(2,389,121)	(3,420,594)
Payments for early repurchase of long-term debt	(1,000,000)	(480,000)	(315,495)
Payments for repurchases of ordinary shares	(322,040)	(509,800)	(400,400)
Proceeds from exercise of stock options	22,257	23,055	23,299
Other financing activities	101,851
Net cash used in financing activities	(339,578)	(522,162)	(641,696)
Effect of exchange rates on cash	(9,895)	(30,884)	18,508
Net change in cash and cash equivalents	68,758	(230,142)	(179,085)
Cash and cash equivalents, beginning of year	1,518,329	1,748,471	1,927,556
Cash and cash equivalents, end of year	1,587,087	1,518,329	1,748,471
Parent
Net cash provided by operating activities	1,136,875	412,529	106,672
Cash flows from investing activities:
Investing cash flows from (to) affiliates	(1,528,819)	363,716	734,710
Other investing activities		(1,500)
Net cash used in investing activities	(1,528,819)	362,216	734,710
Cash flows from financing activities:
Proceeds from bank borrowings and long-term debt	1,250,000	2,827,875	3,471,370
Repayments of bank borrowings and long-term debt	(379,399)	(2,383,596)	(3,196,937)
Payments for early repurchase of long-term debt	(756,855)	(480,000)	(308,466)
Payments for repurchases of ordinary shares	(322,040)	(509,800)	(400,400)
Proceeds from exercise of stock options	22,257	23,055	23,299
Financing cash flows from (to) affiliates	693,185	(112,398)	(472,891)
Net cash used in financing activities	507,148	(634,864)	(884,025)
Effect of exchange rates on cash	(23,941)	(55,416)	32,358
Net change in cash and cash equivalents	91,263	84,465	(10,285)
Cash and cash equivalents, beginning of year	649,252	564,787	575,072
Cash and cash equivalents, end of year	740,515	649,252	564,787
Guarantor Subsidiaries
Net cash provided by operating activities	588,299	(190,136)	19,730
Cash flows from investing activities:
Purchases of property and equipment, net of proceeds from disposal	(134,819)	(67,425)	(46,358)
Acquisition of businesses, net of cash acquired	(20,150)	(70,831)
Investing cash flows from (to) affiliates	(134,715)	294,368	(18,151)
Other investing activities	6,412	4,626	(1,877)
Net cash used in investing activities	(283,272)	160,738	(66,386)
Cash flows from financing activities:
Proceeds from bank borrowings and long-term debt	151
Repayments of bank borrowings and long-term debt	(3,876)	(3,503)	(3,571)
Payments for early repurchase of long-term debt	(243,145)
Financing cash flows from (to) affiliates	(18,006)	16,789	(123,929)
Net cash used in financing activities	(264,876)	13,286	(127,500)
Effect of exchange rates on cash	(5,116)	(2,877)	3,381
Net change in cash and cash equivalents	35,035	(18,989)	(170,775)
Cash and cash equivalents, beginning of year	47,865	66,854	237,629
Cash and cash equivalents, end of year	82,900	47,865	66,854
Non-Guarantor Subsidiaries
Net cash provided by operating activities	(608,973)	594,251	721,985
Cash flows from investing activities:
Purchases of property and equipment, net of proceeds from disposal	(300,750)	(320,300)	(347,421)
Acquisition of businesses, net of cash acquired	(163,947)	(21,426)	(16,966)
Proceeds from divestitures of operations, net	22,585	1,398	625
Investing cash flows from (to) affiliates	3,468,696	1,029,464	(4,191,785)
Other investing activities	(106,771)	(5,627)	(1,154)
Net cash used in investing activities	2,919,813	683,509	(4,556,701)
Cash flows from financing activities:
Proceeds from bank borrowings and long-term debt	62	5,829	124
Repayments of bank borrowings and long-term debt	(8,584)	(2,022)	(220,086)
Payments for early repurchase of long-term debt			(7,029)
Financing cash flows from (to) affiliates	(2,480,871)	(1,604,594)	4,080,913
Other financing activities	101,851
Net cash used in financing activities	(2,387,542)	(1,600,787)	3,853,922
Effect of exchange rates on cash	19,162	27,409	(17,231)
Net change in cash and cash equivalents	(57,540)	(295,618)	1,975
Cash and cash equivalents, beginning of year	821,212	1,116,830	1,114,855
Cash and cash equivalents, end of year	763,672	821,212	1,116,830
Eliminations
Net cash provided by operating activities	(771)	(12,376)	8,957
Cash flows from investing activities:
Purchases of property and equipment, net of proceeds from disposal	241	(279)	(90)
Investing cash flows from (to) affiliates	(1,805,162)	(1,687,548)	3,475,226
Net cash used in investing activities	(1,804,921)	(1,687,827)	3,475,136
Cash flows from financing activities:
Financing cash flows from (to) affiliates	1,805,692	1,700,203	(3,484,093)
Net cash used in financing activities	$ 1,805,692	$ 1,700,203	$ (3,484,093)