Balance Sheet Components (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Accounts receivable:
Accounts receivable	$ 338,194	$ 325,870
Allowance for doubtful accounts	(1,712)	(2,153)
Allowance for sales returns	(19,472)	(21,883)
Allowance for cooperative marketing arrangements	(24,135)	(24,160)
Allowance for customer incentive programs	(41,400)	(42,857)
Allowance for pricing programs	(69,446)	(55,858)
Accounts receivable, net	182,029	178,959
Inventories:
Raw materials	24,031	37,504
Work-in-process	42	41
Finished goods	198,329	225,099
Inventory, net	222,402	262,644
Other current assets:
Income tax and value-added tax receivables	18,252	20,073
Deferred tax asset	27,013	25,004
Prepaid expenses and other assets	13,892	15,300
Other current assets, total	59,157	60,377
Property, plant and equipment, net:
Property, plant and equipment, gross	326,661	337,411
Less accumulated depreciation and amortization	(256,424)	(255,564)
Property, plant and equipment before non-depreciable items	70,237	81,847
Property, plant and equipment, net	88,391	93,721
Other assets:
Deferred tax asset	52,883	52,404
Trading investments	16,611	15,599
Other assets	4,966	6,464
Other assets, total	74,460	74,467
Plant, buildings and improvements
Balance sheet components
Property, plant and equipment, gross	69,897	70,009
Equipment
Balance sheet components
Property, plant and equipment, gross	134,975	133,201
Computer equipment
Balance sheet components
Property, plant and equipment, gross	40,610	52,881
Software
Balance sheet components
Property, plant and equipment, gross	81,179	81,320
Construction-in-process
Balance sheet components
Property, plant and equipment, gross	15,362	9,047
Land
Balance sheet components
Property, plant and equipment, gross	$ 2,792	$ 2,827