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Awards Granted to Company Employees and Non-employee Directors Under the 2007 Equity Incentive Compensation Plan (Detail) (USD $)
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6 Months Ended |
0 Months Ended |
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Mar. 31, 2015
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Mar. 19, 2015
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Jan. 28, 2015
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| Non-qualified stock options |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Granted |
1,408,388 |
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| Weighted-Average Grant Date Fair Value |
$ 12.00 |
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| Weighted-Average Exercise Price |
$ 62.59 |
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| Restricted stock awards (RSAs) |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Granted |
1,855,076 |
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| Weighted-Average Grant Date Fair Value |
$ 62.78 |
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| Restricted stock units (RSUs) |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Granted |
733,340 |
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| Weighted-Average Grant Date Fair Value |
$ 62.56 |
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| Performance-bases shares |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Granted |
785,884 |
[1] |
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| Weighted-Average Grant Date Fair Value |
$ 69.78 |
[1] |
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| Class A common stock |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock split, conversion ratio |
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4 |
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| Employee Stock Purchase Program [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Discount from market price on purchase date (percent) |
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15.00% |
| Shares reserved for issuance (shares) |
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20,000,000 |
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