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Stockholders' Equity - Stock Options Granted (Details)
102 Months Ended
Sep. 30, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 6,413,660
Options Outstanding (in shares) 3,976,593
Options Exercisable (in shares) 1,138,350
April 19, 2016 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 845,440
Option Exercise (Strike) Price (in dollars per share) | $ / shares $ 46.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares $ 45.74
Options Outstanding (in shares) 805,447
Options Exercisable (in shares) 0
April 21, 2015 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 893,220
Option Exercise (Strike) Price (in dollars per share) | $ / shares $ 42.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares $ 41.26
Options Outstanding (in shares) 759,546
Options Exercisable (in shares) 0
April 22, 2014 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 955,000
Option Exercise (Strike) Price (in dollars per share) | $ / shares $ 56.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares $ 50.53
Options Outstanding (in shares) 640,000
Options Exercisable (in shares) 10,000
April 16, 2013 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 205,000
Option Exercise (Strike) Price (in dollars per share) | $ / shares $ 54.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares $ 49.25
Options Outstanding (in shares) 115,000
Options Exercisable (in shares) 2,500
April 17, 2012 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 1,235,000
Option Exercise (Strike) Price (in dollars per share) | $ / shares $ 54.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares $ 49.01
Options Outstanding (in shares) 987,500
Options Exercisable (in shares) 596,750
April 19, 2011 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 410,000
Option Exercise (Strike) Price (in dollars per share) | $ / shares $ 35.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares $ 31.78
Options Outstanding (in shares) 150,800
Options Exercisable (in shares) 113,300
April 20, 2010 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 530,000
Option Exercise (Strike) Price (in dollars per share) | $ / shares $ 30.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares $ 27.13
Options Outstanding (in shares) 180,550
Options Exercisable (in shares) 120,550
April 21, 2009 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 790,000
Option Exercise (Strike) Price (in dollars per share) | $ / shares $ 27.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares $ 17.61
Options Outstanding (in shares) 243,400
Options Exercisable (in shares) 200,900
April 15, 2008 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted (in shares) 550,000
Option Exercise (Strike) Price (in dollars per share) | $ / shares $ 27.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares $ 24.35
Options Outstanding (in shares) 94,350
Options Exercisable (in shares) 94,350