Components of Calculation of Basic Net Income Per Ordinary Share and Diluted Net Income Per Ordinary Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 30, 2013	Mar. 31, 2012	Apr. 02, 2011
Numerator:
Net income	$ 101,101	$ 130,028	$ 97,828	$ 68,645	$ 43,612	$ 39,031	$ 40,606	$ 24,115	$ 397,602	$ 147,364	$ 72,506
Net income applicable to preference shareholders										21,227	15,629
Net income available for ordinary shareholders									$ 397,602	$ 126,137	$ 56,877
Denominator:
Basic weighted average ordinary shares	200,080,126	199,291,480	194,323,935	192,790,454	191,184,171	154,738,356	146,555,601	140,554,377	196,615,054	158,258,126	140,554,377
Weighted average dilutive share equivalents:
Share options and restricted shares/units									4,925,090	2,628,650
Convertible preference shares										28,412,421	38,622,891
Diluted weighted average ordinary shares	203,785,123	202,817,811	200,192,291	199,391,127	196,855,404	193,583,954	187,580,161	179,177,268	201,540,144	189,299,197	179,177,268
Basic net income per ordinary share									$ 2.02	$ 0.80	$ 0.40
Diluted net income per ordinary share									$ 1.97	$ 0.78	$ 0.40