Income Taxes Narrative (Detail) (USD $)	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2013
Income Tax Contingency [Line Items]
Income tax provision (benefit)	$ (3,110,000)	$ 793,000
Reductions in unrecognized tax benefits from expiration	600,000
Tax benefit recognized for research and development tax credit			900,000
Minimum
Income Tax Contingency [Line Items]
Anticipated unrecognized tax benefit reduction during next twelve months	1,300,000
Maximum
Income Tax Contingency [Line Items]
Anticipated unrecognized tax benefit reduction during next twelve months	$ 2,400,000