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Fair Value Measurements - Schedule of Financial Assets Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2012	Aug. 31, 2012
Assets:
Total assets	$ 23,800	$ 5,058
Money market funds [Member]
Assets:
Total assets	1,917	4,025
Term deposits [Member]
Assets:
Total assets	1,045	1,033
Callable time deposits [Member]
Assets:
Total assets	20,838
Level 1 [Member]
Assets:
Total assets	0	0
Level 1 [Member] | Money market funds [Member]
Assets:
Total assets	0	0
Level 1 [Member] | Term deposits [Member]
Assets:
Total assets	0	0
Level 1 [Member] | Callable time deposits [Member]
Assets:
Total assets	0
Level 2 [Member]
Assets:
Total assets	23,800	5,058
Level 2 [Member] | Money market funds [Member]
Assets:
Total assets	1,917	4,025
Level 2 [Member] | Term deposits [Member]
Assets:
Total assets	1,045	1,033
Level 2 [Member] | Callable time deposits [Member]
Assets:
Total assets	20,838
Level 3 [Member]
Assets:
Total assets	0	0
Level 3 [Member] | Money market funds [Member]
Assets:
Total assets	0	0
Level 3 [Member] | Term deposits [Member]
Assets:
Total assets	0	0
Level 3 [Member] | Callable time deposits [Member]
Assets:
Total assets	$ 0

X

- Details

Name:	us-gaap_AssetsFairValueDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant