SUPPLEMENTAL GUARANTOR AND NON-GUARANTOR CONSOLIDATED FINANCIAL STATEMENTS (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Condensed consolidating statements of cash flows
Net cash provided by (used in) operating activities	$ 1,216,460	$ 1,115,430	$ 804,268
Cash flows from investing activities:
Purchases of property and equipment, net of proceeds from disposal	(515,003)	(435,328)	(388,004)
Acquisition of businesses, net of cash acquired	(238,031)	(184,097)	(92,257)
Proceeds from divestitures of business, net of cash held in divested business	4,599	22,585	1,398
Other investing activities, net	(35,497)	(100,359)	(2,501)
Net cash provided by (used in) investing activities	(783,932)	(697,199)	(481,364)
Cash flows from financing activities:
Proceeds from bank borrowings and long-term debt	1,066,653	1,250,213	2,833,704
Repayments of bank borrowings and long-term debt and capital lease obligations	(537,580)	(391,859)	(2,389,121)
Payments for early repurchase of long-term debt	(544,840)	(1,000,000)	(480,000)
Payments for repurchases of ordinary shares	(475,314)	(322,040)	(509,800)
Proceeds from exercise of stock options	28,140	22,257	23,055
Other financing activities, net	52,149	101,851
Net cash provided by (used in) financing activities	(410,792)	(339,578)	(522,162)
Effect of exchange rates on cash and cash equivalents	(15,095)	(9,895)	(30,884)
Net change in cash and cash equivalents	6,641	68,758	(230,142)
Cash and cash equivalents, beginning of year	1,587,087	1,518,329	1,748,471
Cash and cash equivalents, end of year	1,593,728	1,587,087	1,518,329
Parent | Reportable legal entities
Condensed consolidating statements of cash flows
Net cash provided by (used in) operating activities	459,748	836,833	399,896
Cash flows from investing activities:
Investing cash flows from (to) affiliates	35,262	(1,228,776)	376,349
Other investing activities, net			(1,500)
Net cash provided by (used in) investing activities	35,262	(1,228,776)	374,849
Cash flows from financing activities:
Proceeds from bank borrowings and long-term debt	1,066,359	1,250,000	2,827,875
Repayments of bank borrowings and long-term debt and capital lease obligations	(492,034)	(379,399)	(2,383,596)
Payments for early repurchase of long-term debt	(503,423)	(756,855)	(480,000)
Payments for repurchases of ordinary shares	(475,314)	(322,040)	(509,800)
Proceeds from exercise of stock options	28,140	22,257	23,055
Financing cash flows from (to) affiliates	(277,595)	693,185	(112,398)
Net cash provided by (used in) financing activities	(653,867)	507,148	(634,864)
Effect of exchange rates on cash and cash equivalents	57,055	(23,942)	(55,416)
Net change in cash and cash equivalents	(101,801)	91,263	84,465
Cash and cash equivalents, beginning of year	740,515	649,252	564,787
Cash and cash equivalents, end of year	638,714	740,515	649,252
Guarantor Subsidiaries | Reportable legal entities
Condensed consolidating statements of cash flows
Net cash provided by (used in) operating activities	(371,978)	588,298	(190,136)
Cash flows from investing activities:
Purchases of property and equipment, net of proceeds from disposal	(194,878)	(134,819)	(67,425)
Acquisition of businesses, net of cash acquired	(2,949)	(20,150)	(70,831)
Investing cash flows from (to) affiliates	(506,382)	(134,715)	294,368
Other investing activities, net	(5,342)	6,412	4,626
Net cash provided by (used in) investing activities	(709,551)	(283,272)	160,738
Cash flows from financing activities:
Proceeds from bank borrowings and long-term debt	277	150
Repayments of bank borrowings and long-term debt and capital lease obligations	(525)	(3,875)	(3,503)
Payments for early repurchase of long-term debt	(41,417)	(243,145)
Financing cash flows from (to) affiliates	1,067,746	(18,006)	16,789
Net cash provided by (used in) financing activities	1,026,081	(264,876)	13,286
Effect of exchange rates on cash and cash equivalents	3,048	(5,115)	(2,877)
Net change in cash and cash equivalents	(52,400)	35,035	(18,989)
Cash and cash equivalents, beginning of year	82,900	47,865	66,854
Cash and cash equivalents, end of year	30,500	82,900	47,865
Non-Guarantor Subsidiaries | Reportable legal entities
Condensed consolidating statements of cash flows
Net cash provided by (used in) operating activities	1,128,906	(309,276)	594,630
Cash flows from investing activities:
Purchases of property and equipment, net of proceeds from disposal	(319,540)	(300,750)	(320,300)
Acquisition of businesses, net of cash acquired	(235,082)	(163,947)	(21,426)
Proceeds from divestitures of business, net of cash held in divested business	4,599	22,585	1,398
Investing cash flows from (to) affiliates	(1,744,370)	3,168,999	1,029,085
Other investing activities, net	(30,155)	(106,771)	(5,627)
Net cash provided by (used in) investing activities	(2,324,548)	2,620,116	683,130
Cash flows from financing activities:
Proceeds from bank borrowings and long-term debt	17	63	5,829
Repayments of bank borrowings and long-term debt and capital lease obligations	(45,021)	(8,585)	(2,022)
Financing cash flows from (to) affiliates	1,424,537	(2,480,871)	(1,604,594)
Other financing activities, net	52,149	101,851
Net cash provided by (used in) financing activities	1,431,682	(2,387,542)	(1,600,787)
Effect of exchange rates on cash and cash equivalents	(75,198)	19,162	27,409
Net change in cash and cash equivalents	160,842	(57,540)	(295,618)
Cash and cash equivalents, beginning of year	763,672	821,212	1,116,830
Cash and cash equivalents, end of year	924,514	763,672	821,212
Eliminations
Condensed consolidating statements of cash flows
Net cash provided by (used in) operating activities	(216)	(425)	(122)
Cash flows from investing activities:
Purchases of property and equipment, net of proceeds from disposal	(585)	241	(279)
Investing cash flows from (to) affiliates	2,215,490	(1,805,508)	(1,699,802)
Net cash provided by (used in) investing activities	2,214,905	(1,805,267)	(1,700,081)
Cash flows from financing activities:
Financing cash flows from (to) affiliates	(2,214,688)	1,805,692	1,700,203
Net cash provided by (used in) financing activities	$ (2,214,688)	$ 1,805,692	$ 1,700,203