STOCK-BASED COMPENSATION (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | | 6 Months Ended |
Sep. 30, 2013 | Mar. 31, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Mar. 31, 2013 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Nov. 30, 2011 | Nov. 30, 2010 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Nov. 07, 2011 | Nov. 07, 2011 | Nov. 08, 2010 | Nov. 07, 2011 | Nov. 08, 2010 | Sep. 30, 2013 | Feb. 06, 2013 | Dec. 07, 2012 | Dec. 11, 2012 | Sep. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2013 | Dec. 07, 2012 | Dec. 11, 2012 | Sep. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2013 |
Stock Options Plans [Member] | Stock Options Plans [Member] | Stock Options Plans [Member] | Stock Options Plans [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Restricted Stock [Member] | Equity Securities [Member] | Equity Securities [Member] | Equity Securities [Member] | Equity Securities [Member] | Performance Shares [Member] | Maximum [Member] | Maximum [Member] | Maximum [Member] |
| | | | | | | | | | 15% or higher [Member] | 12% - 14.99% [Member] | 10% - 11.99% [Member] | Below 10% [Member] | Vesting Percentage 100% [Member] | Vesting Percentage 100% [Member] | Vesting Percentage 67% [Member] | Vesting Percentage 67% [Member] | Vesting Percentage 33% [Member] | Vesting Percentage 33% [Member] | Vesting Percentage 0% [Member] | Vesting Percentage 0% [Member] | Service Based Award [Member] | Service Based Award [Member] | Service Based Award [Member] | Performance Based Awards [Member] | Performance Based Awards [Member] | EPS Target [Member] | EPS Target [Member] | EPS Target [Member] | EPS Target [Member] | EPS Target [Member] | EPS Target [Member] | EPS Target [Member] | EPS Target [Member] | Trailing Four Quarter EPS Target [Member] | Trailing Four Quarter EPS Target [Member] | Trailing Four Quarter EPS Target [Member] | Trailing Four Quarter EPS Target [Member] | Trailing Four Quarter EPS Target [Member] | Trailing Four Quarter EPS Target [Member] | Trailing Four Quarter EPS Target [Member] | | | | | | Stock Options Plans [Member] | Stock Options Plans [Member] | Restricted Stock [Member] |
| | | | | | | | | | | | | | | | | | | | | | Officers [Member] | Executive Officers [Member] | Executive Officers [Member] | Executive Officers [Member] | Executive Officers [Member] | Performance Based Awards [Member] | Performance Based Awards [Member] | Performance Based Awards [Member] | Performance Based Awards [Member] | $10.29 EPS [Member] | $9.76 EPS [Member] | $9.26 EPS [Member] | Below $9.26 EPS [Member] | Performance Based Awards [Member] | Performance Based Awards [Member] | Performance Based Awards [Member] | $13.00 [Member] | $14.50 [Member] | $16.00 [Member] | $18.00 [Member] | | | | | | | Officers [Member] | EPS Target [Member] |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Directors and Officers [Member] | Directors and Officers [Member] | Officers [Member] | | | | | | Directors and Officers [Member] | Officers [Member] | | | | | | | | | | | | Below $9.26 EPS [Member] |
Stock Option Plans [Abstract] | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Shares of authorized common stock reserved for issuance (in shares) | ' | ' | ' | ' | ' | 4,100,000 | ' | 4,100,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Vesting period | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | '10 years | '5 years | ' |
Number of shares available for grant (in shares) | ' | ' | ' | ' | ' | 414,488 | ' | 414,488 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Weighted-average fair value at the grant date | $0 | $0 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Options Activity [Roll Forward] | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Options outstanding, beginning of year (in shares) | ' | ' | ' | ' | ' | ' | ' | 1,249,585 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Granted (in shares) | ' | ' | ' | ' | ' | ' | ' | 0 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Exercised (in shares) | ' | ' | -40,345 | ' | -332,665 | ' | ' | -40,345 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Forfeited (in shares) | ' | ' | ' | ' | ' | ' | ' | -17,300 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Expired (in shares) | ' | ' | ' | ' | ' | ' | ' | 0 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Options outstanding, end of period (in shares) | ' | ' | ' | ' | ' | 1,191,940 | ' | 1,191,940 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Options exercisable, end of period (in shares) | ' | ' | ' | ' | ' | 164,960 | ' | 164,960 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Weighted Average Exercise Price [Roll Forward] | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Options outstanding, beginning of year (in dollars per share) | ' | ' | ' | ' | ' | ' | ' | $54.90 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Granted (in dollars per share) | ' | ' | ' | ' | ' | ' | ' | $0 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Exercised (in dollars per share) | ' | ' | ' | ' | ' | ' | ' | $35.98 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Forfeited (in dollars per share) | ' | ' | ' | ' | ' | ' | ' | $52.93 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Expired (in dollars per share) | ' | ' | ' | ' | ' | ' | ' | $0 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Options outstanding, end of period (in dollars per share) | ' | ' | ' | ' | ' | $55.57 | ' | $55.57 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Options exercisable, end of period (in dollars per share) | ' | ' | ' | ' | ' | $32.27 | ' | $32.27 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Stock Option Activity Additional Disclosures [Abstract] | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Weighted-average remaining contractual term, Options outstanding, end of period | ' | ' | ' | ' | ' | ' | ' | '7 years 6 months 26 days | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Weighted-average remaining contractual terms, Options exercisable, end of period | ' | ' | ' | ' | ' | ' | ' | '3 years 10 months 6 days | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Aggregate intrinsic value, Options outstanding, end of period | ' | ' | ' | ' | ' | $40,941,289 | ' | $40,941,289 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Aggregate intrinsic value, Options exercisable, end of period | ' | ' | ' | ' | ' | 9,510,601 | ' | 9,510,601 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Intrinsic value of options exercised | ' | ' | ' | ' | ' | 1,107,812 | 2,210,159 | 2,151,214 | 4,949,689 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Compensation Cost Not yet Recognized [Abstract] | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Total unrecognized stock-based compensation expense related to non-vested stock options | ' | ' | ' | ' | ' | 18,900,000 | ' | 18,900,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Weighted average period for recognition | ' | ' | ' | ' | ' | ' | ' | '3 years 8 months 1 day | ' | ' | ' | ' | ' | '3 years 0 months 11 days | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Restricted Stock [Abstract] | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Awards granted (in shares) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 0 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Grant date fair value (in dollars per share) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | $0 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | $67.70 | $67.70 | $43.04 | $67.70 | $43.04 | ' | $77.31 | $74.08 | $73.41 | ' | ' | ' | ' | ' | $74.08 | $73.41 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Award vesting date | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 30-Apr-14 | 30-Apr-13 | 30-Apr-15 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Ratio of restricted stock vesting immediately (in hundredths) | ' | ' | ' | ' | ' | ' | ' | ' | ' | 33.33% | 33.33% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Ratio of restricted stock vesting after year one (in hundredths) | ' | ' | ' | ' | ' | ' | ' | ' | ' | 33.33% | 33.33% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Ratio of restricted stock vesting after year two (in hundredths) | ' | ' | ' | ' | ' | ' | ' | ' | ' | 33.33% | 33.33% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Schedule of vesting of restricted shares on basis of compounded annual EPS growth [Abstract] | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Vesting Percentage (in hundredths) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 100.00% | 67.00% | 33.00% | 0.00% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 100.00% | 67.00% | 33.00% | 0.00% | ' | ' | ' | 25.00% | 25.00% | 25.00% | 25.00% | ' | ' | ' | ' | ' | ' | ' | ' |
EPS Target | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 10.29 | 9.76 | 9.26 | ' | ' | ' | ' | 13 | 14.5 | 16 | 18 | ' | ' | ' | ' | ' | ' | ' | 9.26 |
Compounded Annual EPS Growth, Minimum (in hundredths) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 15.00% | 15.00% | 12.00% | 12.00% | 10.00% | 10.00% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Compounded Annual EPS Growth, Maximum (in hundredths) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 14.99% | 14.99% | 11.99% | 11.99% | 10.00% | 10.00% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 19,700,000 | ' | 19,700,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Weighted average period for recognition | ' | ' | ' | ' | ' | ' | ' | '3 years 8 months 1 day | ' | ' | ' | ' | ' | '3 years 0 months 11 days | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Unrecognized compensation cost related to unvested restricted stock awards granted | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 7,098,223 | ' | ' | ' |
Summary of the status and changes in restricted stock [Roll Forward] | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Outstanding at March 31, 2012 (in shares) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 562,456 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Awards granted (in shares) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 24,200 | 15,077 | 29,080 | 11,139 | 15,871 | 70,800 | 85,000 | 69,600 | 1,200 | ' | ' | ' | ' | 358,700 | 350,900 | 7,800 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Vested during the period, net of cancellations (in shares) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | -10,563 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Cancelled during the period (in shares) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | -5,308 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Outstanding at June 30, 2012 (in shares) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 546,585 | ' | 546,585 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Outstanding at March 31, 2012 (in dollars per share) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | $73.32 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Grant date fair value (in dollars per share) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | $0 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | $67.70 | $67.70 | $43.04 | $67.70 | $43.04 | ' | $77.31 | $74.08 | $73.41 | ' | ' | ' | ' | ' | $74.08 | $73.41 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Vested during the period, net of cancellations (in dollars per share) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | $43.04 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Cancelled during the period (in dollars per share) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | $88.86 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Outstanding at June 30, 2012 (in dollars per share) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | $74.20 | ' | $74.20 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Compensation related to stock option and restricted stock plans | ' | ' | $8,774,815 | $3,810,220 | ' | $2,643,855 | $1,270,993 | $5,139,768 | $2,493,015 | ' | ' | $1,917,730 | $576,507 | $4,106,716 | $1,832,391 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | $4,561,585 | $1,847,500 | $9,246,484 | $4,325,406 | ' | ' | ' | ' |