Employee Share Based Plans (Details) (USD $)	0 Months Ended			1 Months Ended	12 Months Ended			36 Months Ended	60 Months Ended
	Dec. 15, 2016	Dec. 15, 2015	Dec. 15, 2014	Dec. 31, 2011	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2014	Dec. 15, 2016
Incentive Plan Payout Matrix [Line Items]
Unvested Shares Issued To CEO				64,700
Incentive Compensation Plan Percentage Of Common Stock Vested	50%	30%	20%
Compensation Expense					$ 5,730,000	$ 2,604,000	$ 6,118,000
Tax Benefit					2,080,000	673,000	1,756,000
Liability					10,631,000	5,015,000
Incentive Compensation Plan Expected Payout In One Year					3,842,000
Incentive Compensation Plan Expected Payout In Two Years					4,471,000
Incentive Compensation Plan Expected Payout In Three Years					1,990,000
Incentive Compensation Plan Expected Payout In Four Years					141,000
Incentive Compensation Plan Expected Payout In Five Years					$ 187,000
Employee Stock Purchase Plan Exercise Price As A Percentage Of Fair Market Value					95.00%
Vesting Period For Common Stock Granted Years									5 years
Number Of Incentive Compensation Plan Awards					3
Number Of Performance Periods Under Icp Plans								3
EPS Performance Achievement Below 80 Percent of Target [Member]
Incentive Plan Payout Matrix [Line Items]
Incentive Compensation Plan Payout Percentage					0.00%
EPS Performance Achievement 80 Percent Of Target [Member]
Incentive Plan Payout Matrix [Line Items]
Incentive Compensation Plan Payout Percentage					80.00%
EPS Performance Achievement 100 Percent Of Target [Member]
Incentive Plan Payout Matrix [Line Items]
Incentive Compensation Plan Payout Percentage					100.00%
EPS Performance Achievement 120 Percent Of Target [Member]
Incentive Plan Payout Matrix [Line Items]
Incentive Compensation Plan Payout Percentage					120.00%
Annual Shareholder Return Achievement At Less Than 25 Percentile [Member]
Incentive Plan Payout Matrix [Line Items]
Incentive Compensation Plan Payout Percentage					0.00%
Annual Shareholder Return Achievement Between 25 And 39 Percentile [Member]
Incentive Plan Payout Matrix [Line Items]
Incentive Compensation Plan Payout Percentage					80.00%
Annual Shareholder Return Achievement Between 40 And 49 Percentile [Member]
Incentive Plan Payout Matrix [Line Items]
Incentive Compensation Plan Payout Percentage					90.00%
Annual Shareholder Return Achievement Between 50 And 74 Percentile [Member]
Incentive Plan Payout Matrix [Line Items]
Incentive Compensation Plan Payout Percentage					100.00%
Annual Shareholder Return Achievement Between 75 And 89 Percentile [Member]
Incentive Plan Payout Matrix [Line Items]
Incentive Compensation Plan Payout Percentage					110.00%
Annual Shareholder Return Achievement Greater Than Or Equal To 90 Percentile [Member]
Incentive Plan Payout Matrix [Line Items]
Incentive Compensation Plan Payout Percentage					120.00%
EPS Performance [Member]
Share Based Awards Allocation [Line Items]
3 Years Period Allocation Of Performance Units					50.00%
Annual Shareholder Return [Member]
Share Based Awards Allocation [Line Items]
3 Years Period Allocation Of Performance Units					50.00%