Marketable Securities - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended
Feb. 15, 2014 Securities	Feb. 15, 2014 Securities	Aug. 31, 2013
Investments Debt And Equity Securities [Abstract]
Available for sale securities debt maturity period range		Less than one year to approximately 3 years
Number of securities available for sale loss position	14	14
Available-For-Sale Marketable Securities, Gross Unrealized Losses	$ (109,000)	$ (109,000)	$ (277,000)
Marketable securities transferred	$ 28,200,000

Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (b)(3)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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