|
Investments - Summary of Company's Available for Sale Securities (Detail) (USD $)
In Thousands, unless otherwise specified
|
Apr. 06, 2013
|
Jun. 30, 2012
|
Mar. 31, 2012
|
|
Short term Investments [Member]
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
| Cost |
$ 41,084 |
$ 76,428 |
$ 79,926 |
| Unrealized Losses Less Than 12 Months |
0 |
0 |
0 |
| Unrealized Losses 12 Months or Greater |
0 |
0 |
0 |
| Estimated Fair Value |
41,084 |
76,428 |
79,926 |
|
Short term Investments [Member] | Treasury bills [Member]
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
| Cost |
11,977 |
49,960 |
56,952 |
| Unrealized Losses Less Than 12 Months |
0 |
0 |
0 |
| Unrealized Losses 12 Months or Greater |
0 |
0 |
0 |
| Estimated Fair Value |
11,977 |
49,960 |
56,952 |
|
Short term Investments [Member] | Short term certificates of deposit [Member]
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
| Cost |
29,107 |
26,468 |
22,974 |
| Unrealized Losses Less Than 12 Months |
0 |
0 |
0 |
| Unrealized Losses 12 Months or Greater |
0 |
0 |
0 |
| Estimated Fair Value |
29,107 |
26,468 |
22,974 |
|
Long term Investments [Member]
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
| Cost |
65,500 |
|
|
| Unrealized Losses Less Than 12 Months |
0 |
|
|
| Unrealized Losses 12 Months or Greater |
(6,879) |
|
|
| Estimated Fair Value |
58,621 |
|
|
|
Long term Investments [Member] | Treasury bills [Member]
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
| Cost |
19,950 |
|
|
| Unrealized Losses Less Than 12 Months |
0 |
|
|
| Unrealized Losses 12 Months or Greater |
0 |
|
|
| Estimated Fair Value |
19,950 |
|
|
|
Long term Investments [Member] | Long term auction rate securities [Member]
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
| Cost |
45,550 |
67,900 |
74,000 |
| Unrealized Losses Less Than 12 Months |
0 |
0 |
0 |
| Unrealized Losses 12 Months or Greater |
(6,879) |
(7,898) |
(9,590) |
| Estimated Fair Value |
$ 38,671 |
$ 60,002 |
$ 64,410 |