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Stock-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 Stock Options | Mar. 31, 2013 Stock Options | Dec. 31, 2013 Stock Options | Mar. 31, 2014 Restricted Shares | Jun. 30, 2013 Restricted Shares | Jun. 30, 2013 Restricted Shares | Mar. 31, 2014 2000 Employee Option Plan | Mar. 31, 2014 2009 Employee Option Plan | Mar. 31, 2014 2000 Employee Option Plan and 2009 Employee Option Plan | Mar. 31, 2014 2004 Directors Option Plan | Mar. 31, 2014 2012 Directors Restricted Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional stock options that can be granted (in shares) |  |  |  |  |  |  |  |  | 0 |  |  |  |
Shares available for the granting of additional stock options |  |  |  |  |  |  |  |  |  | 2,375,110 |  | 70,000 | 95,131
Options ratable vesting period |  |  |  |  |  |  |  |  |  |  | 5 years | 3 years |
Options exercisable period |  |  |  |  |  |  |  |  |  |  | 10 years | 10 years |
Number of additional stock options expected to be granted (in shares) |  |  |  |  |  |  |  |  |  |  |  | 0 |
Expense incurred for stock-based compensation plans (in dollars) | $ 9,276 | $ 8,283 |  |  |  |  |  |  |  |  |  |  |
Expense incurred for stock-based compensation plans, net of tax (in dollars) | 6,804 | 6,031 |  |  |  |  |  |  |  |  |  |  |
Stock option activity |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding at the beginning of the period (in shares) |  |  | 13,422,226 |  |  |  |  |  |  |  |  |  |
Options granted (in shares) |  |  | 32,500 |  |  |  |  |  |  |  |  |  |
Options exercised (in shares) |  |  | (314,966) |  |  |  |  |  |  |  |  |  |
Options forfeited (in shares) |  |  | (51,460) |  |  |  |  |  |  |  |  |  |
Options outstanding at the end of the period (in shares) |  |  | 13,088,300 |  | 13,422,226 |  |  |  |  |  |  |  |
Vested and non-vested options expected to vest at the end of the period (in shares) |  |  | 11,928,448 |  |  |  |  |  |  |  |  |  |
Exercisable at the end of the period (in shares) |  |  | 5,097,339 |  |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price, options outstanding at the beginning of the period (in dollars per share) |  |  | $ 51.80 |  |  |  |  |  |  |  |  |  |
Weighted average exercise price, options granted (in dollars per share) |  |  | $ 89.13 |  |  |  |  |  |  |  |  |  |
Weighted average exercise price, options exercised (in dollars per share) |  |  | $ 40.41 |  |  |  |  |  |  |  |  |  |
Weighted average exercise price, options forfeited (in dollars per share) |  |  | $ 59.80 |  |  |  |  |  |  |  |  |  |
Weighted average exercise price, options outstanding at the end of the period (in dollars per share) |  |  | $ 52.14 |  | $ 51.80 |  |  |  |  |  |  |  |
Weighted average exercise price, vested and non-vested options expected to vest (in dollars per share) |  |  | $ 51.50 |  |  |  |  |  |  |  |  |  |
Weighted average exercise price, exercisable (in dollars per share) |  |  | $ 41.15 |  |  |  |  |  |  |  |  |  |
Weighted Average Remaining Contractual Term |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual term of options outstanding |  |  | 6 years 10 months 20 days |  | 7 years 29 days |  |  |  |  |  |  |  |
Weighted average remaining contractual term of options vested options and non-vested expected to vest |  |  | 6 years 9 months 18 days |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual term of options exercisable |  |  | 5 years 4 months 10 days |  |  |  |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of options outstanding (in dollars) |  |  | 517,164 |  | 501,706 |  |  |  |  |  |  |  |
Aggregate intrinsic value of options, vested and non-vested options expected to vest (in dollars) |  |  | 478,893 |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of options exercisable (in dollars) |  |  | 257,418 |  |  |  |  |  |  |  |  |  |
Status of the Company's non-vested options and changes during the year |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested options at the beginning of the period (in shares) |  |  | 8,016,921 |  |  |  |  |  |  |  |  |  |
Non-vested options, options granted (in shares) |  |  | 32,500 |  |  |  |  |  |  |  |  |  |
Non-vested options, options vested (in shares) |  |  | (7,000) |  |  |  |  |  |  |  |  |  |
Non-vested options, options forfeited (in shares) |  |  | (51,460) |  |  |  |  |  |  |  |  |  |
Non-vested options at the end of the period (in shares) |  |  | 7,990,961 |  | 8,016,921 |  |  |  |  |  |  |  |
Weighted Average Fair Value at Grant Date |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average fair value at the grant date, options outstanding at the beginning of the period (in dollars per share) |  |  | $ 14.77 |  |  |  |  |  |  |  |  |  |
Weighted average fair value at grant date, options granted (in dollars per share) |  |  | $ 21.23 |  |  |  |  |  |  |  |  |  |
Weighted average fair value at grant date, options vested (in dollars per share) |  |  | $ 16.98 |  |  |  |  |  |  |  |  |  |
Weighted average fair value at grant date, options forfeited (in dollars per share) |  |  | $ 14.82 |  |  |  |  |  |  |  |  |  |
Weighted average fair value at the grant date, options outstanding at the end of the period (in dollars per share) |  |  | $ 14.79 |  | $ 14.77 |  |  |  |  |  |  |  |
Total intrinsic value of stock options exercised (in dollars) |  |  | 15,560 | 40,542 |  |  |  |  |  |  |  |  |
Total fair value of stock options vested (in dollars) |  |  | 119 | 135 |  |  |  |  |  |  |  |  |
Total compensation cost related to non-vested options not yet recognized (in dollars) |  |  | 76,647 |  |  |  |  |  |  |  |  |  |
Weighted average expected amortization period |  |  | 3 years 2 months 19 days |  |  | 1 month 24 days |  |  |  |  |  |  |
Number of restricted shares issued |  |  |  |  |  |  | 12,824 | 17,045 |  |  |  |  |
Weighted-average grant date fair value of restricted shares (in dollars per share) |  |  |  |  |  |  | $ 78.00 | $ 53.78 |  |  |  |  |
Total compensation cost related to non-vested restricted shares not yet recognized (in dollars) |  |  |  |  |  | $ 155 |  |  |  |  |  |  |

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- Definition As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options vested. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of options vested. + References No definition available. + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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