Stock-Based Compensation (Details) (USD $)	12 Months Ended							12 Months Ended		12 Months Ended	0 Months Ended		12 Months Ended	0 Months Ended	12 Months Ended				12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2014 Stock Options	Sep. 30, 2014 Restricted Stock Units	Sep. 30, 2014 The 2014 Plan	Jan. 27, 2014 The 2014 Plan	Sep. 30, 2014 The 2014 Plan Stock Options	Jan. 28, 2013 The 2013 Plan	Sep. 30, 2014 The 2013 Plan Stock Options	Jan. 25, 2010 The Omnibus Plan	Dec. 04, 2009 The Omnibus Plan	Sep. 30, 2014 The Stock Option Plan and Non-Officer Plan Stock Options	Jan. 27, 2014 The Purchase Plan	Sep. 30, 2014 The Purchase Plan	Sep. 30, 2013 The Purchase Plan	Sep. 30, 2012 The Purchase Plan	Jan. 27, 2014 The Purchase Plan	Sep. 30, 2014 Director [Member] The 2014 Plan Restricted Stock Units	Sep. 30, 2014 Director [Member] The 2013 Plan Restricted Stock Units	Sep. 30, 2014 Executive Officer [Member] The 2014 Plan Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized							2,250,000		1,750,000			5,750,000						2,800,000
Expiration period								8 years		8 years			10 years
Vesting period								4 years		4 years			4 years						1 year	1 year	3 years
Number of shares available for future grants						1,844,072
Number of additional shares authorized											2,500,000			800,000
Proceeds from stock option plan transactions	$ 3,689,000	$ 2,193,000	$ 1,072,000
Excess tax benefits from stock-based compensation	(44,000)	(67,000)	(198,000)
Number of continuous days of service															90 days
Number of hours per week employed															20 hours
Percent of market value															85.00%
Offering period															3 months
Employee contributions															1,000,000	1,000,000	1,000,000
Common shares issued to employees															129,449	128,853	115,477
Shares available for future issuance															741,378
Total intrinsic value of all options exercised	500,000	500,000	700,000
Forfeiture rate	2.00%
Total unrecognized compensation cost nonvested awards				6,700,000
Total grant date fair value of shares vested	800,000	3,100,000	3,000,000
Total unrecognized compensation cost, restricted stock units					$ 1,100,000
Weighted average period, unrecognized compensation cost, nonvested awards				2 years 3 months 21 days	1 year 1 month 27 days