Certain Financial Statement Information - Schedule of Goodwill and purchased intangible assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Schedule of Goodwill
Beginning balance, gross		$ 4,441,026	$ 4,441,026
Accumulated amortization and impairments	(4,441,026)	(4,441,026)
Beginning balance, net	0	0
Goodwill	13,183	13,183
TPack [Member]
Schedule of Goodwill
Goodwill		$ 13,183

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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+ Details

- Definition

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

+ References

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+ Details