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Fair Value Measurements - Items are Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
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Apr. 06, 2013
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Mar. 31, 2012
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Non-current available for sale securities |
$ 38,700 |
|
|
Fair value, measurements, recurring [Member]
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Cash equivalents |
46,430 |
46,385 |
| Current available for sale securities |
41,084 |
79,926 |
| Non-current available for sale securities |
58,621 |
64,410 |
| Total |
146,135 |
190,721 |
|
Fair value, measurements, recurring [Member] | Level 1 [Member]
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|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Cash equivalents |
46,430 |
46,385 |
| Current available for sale securities |
11,977 |
56,952 |
| Non-current available for sale securities |
19,950 |
0 |
| Total |
78,357 |
103,337 |
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Fair value, measurements, recurring [Member] | Level 2 [Member]
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Cash equivalents |
0 |
0 |
| Current available for sale securities |
29,107 |
22,974 |
| Non-current available for sale securities |
0 |
0 |
| Total |
29,107 |
22,974 |
|
Fair value, measurements, recurring [Member] | Level 3 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Cash equivalents |
0 |
0 |
| Current available for sale securities |
0 |
0 |
| Non-current available for sale securities |
38,671 |
64,410 |
| Total |
$ 38,671 |
$ 64,410 |