Short-Term Investments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 26, 2014
Investments, Debt and Equity Securities [Abstract]
Available-for-sale securities in a material unrealized loss position	$ 0

Number of investment positions in available-for-sale investments in a continuous unrealized loss position for less than one year or normal operating cycle, if longer, for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

No definition available.

Name:	us-gaap_AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant