Equity Securities and Stock-Based Compensation - Stockholder Approval Information (Details) shares in Thousands	12 Months Ended
	Sep. 30, 2016 $ / shares shares
Equity Securities and Stock-based Compensation
Maximum shares to be issued upon exercise of options and other awards	3,651
Weighted-average exercise price of outstanding options and other awards | $ / shares	$ 7.20
Shares remaining available for future issuance under existing equity compensation plans	3,469
Plans Approved by Stockholders
Equity Securities and Stock-based Compensation
Maximum shares to be issued upon exercise of options and other awards	3,448
Weighted-average exercise price of outstanding options and other awards | $ / shares	$ 6.73
Shares remaining available for future issuance under existing equity compensation plans	3,469
Plans Not Approved by Stockholders
Equity Securities and Stock-based Compensation
Maximum shares to be issued upon exercise of options and other awards	203
Weighted-average exercise price of outstanding options and other awards | $ / shares	$ 15.22