CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income Loss [Member]	Total
BALANCE at Mar. 31, 2010	$ 2,250	$ 606,484	$ 305,441	$ (362)	$ 913,813
BALANCE (in shares) at Mar. 31, 2010	224,982,171
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)			107,441		107,441
Foreign currency translation, net of tax				(379)	(379)
Issuance of common stock	3	2,504			2,507
Issuance of common stock (in shares)	291,800
Repurchase of common stock	(173)	(48,527)	(115,815)		(164,515)
Repurchase of common stock (in shares)	(17,243,502)				(16,900,000)
Exercise/release of employee stock awards and related tax benefit (Note 17)	97	74,880			74,977
Exercise/release of employee stock awards and related tax benefit (Note 17) (in shares)	9,690,070
Stock awards compensation		18,768			18,768
BALANCE at Mar. 31, 2011	2,177	654,109	297,067	(741)	952,612
BALANCE (in shares) at Mar. 31, 2011	217,720,539
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)			88,371		88,371
Foreign currency translation, net of tax				(9,809)	(9,809)
Issuance of common stock	4	2,807			2,811
Issuance of common stock (in shares)	351,496
Repurchase of common stock	(24)	(7,500)	(13,030)		(20,554)
Repurchase of common stock (in shares)	(2,407,655)				(2,300,000)
Exercise/release of employee stock awards and related tax benefit (Note 17)	18	11,764			11,782
Exercise/release of employee stock awards and related tax benefit (Note 17) (in shares)	1,841,939
Stock awards compensation		24,724			24,724
BALANCE at Mar. 31, 2012	2,175	685,904	372,408	(10,550)	1,049,937
BALANCE (in shares) at Mar. 31, 2012	217,506,319				217,506,319
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)			(17,251)		(17,251)
Foreign currency translation, net of tax				(8,234)	(8,234)
Issuance of common stock	3	2,768			2,771
Issuance of common stock (in shares)	295,478
Repurchase of common stock	(88)	(28,169)	(53,859)		(82,116)
Repurchase of common stock (in shares)	(8,760,412)				(8,600,000)
Exercise/release of employee stock awards and related tax benefit (Note 17)	42	21,400			21,442
Exercise/release of employee stock awards and related tax benefit (Note 17) (in shares)	4,176,663
Stock awards compensation		31,677			31,677
BALANCE at Mar. 31, 2013	$ 2,132	$ 713,580	$ 301,298	$ (18,784)	$ 998,226
BALANCE (in shares) at Mar. 31, 2013	213,218,048				213,218,048