CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Net income	$ 22,013	$ 8,685
Other comprehensive income (loss):
Change in unrealized gains on available-for-sale securities (net of tax)	(6)	5
Foreign currency translation adjustments	304	(509)
Other comprehensive income (loss)	298	(504)
Total comprehensive income	$ 22,311	$ 8,181