Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands |
1 Months Ended |
3 Months Ended |
6 Months Ended |
Mar. 31, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2016 |
Aug. 31, 2016 |
| Stockholders' equity |
|
|
|
|
|
| Compensation cost not yet recognized |
|
|
$ 14,000
|
$ 14,000
|
|
| 2015 Stock Incentive Plan | Nonvested stock units issued (NSUs) |
|
|
|
|
|
| Stockholders' equity |
|
|
|
|
|
| Vesting rights percent |
|
|
|
33.33%
|
|
| Number of shares granted |
|
|
64,000
|
84,000
|
|
| Award vesting period of the grants |
|
|
|
3 years
|
|
| Weighted average grant date fair value (in USD per share) |
|
|
$ 68.55
|
$ 65.86
|
|
| 2015 Stock Incentive Plan | Time-based equity award |
|
|
|
|
|
| Stockholders' equity |
|
|
|
|
|
| Number of shares granted |
|
|
105,000
|
156,000
|
|
| Award vesting period of the grants |
|
|
|
3 years
|
|
| Weighted average grant date fair value (in USD per share) |
|
|
$ 65.83
|
$ 62.83
|
|
| 2015 Employee Stock Purchase Plan |
|
|
|
|
|
| Stockholders' equity |
|
|
|
|
|
| Common stock reserved for issuance (in shares) |
|
1,000,000
|
|
|
|
| Employee stock purchase plan, purchase period |
6 months
|
|
|
|
|
| Employee stock purchase plan discount |
|
15.00%
|
|
|
|
| Stock Issued During Period, Shares, Employee Stock Purchase Plans |
|
|
|
|
7,000,000
|
| Shares Issued, Price Per Share |
|
|
|
|
$ 55,550
|
| 2015 Stock Repurchase Program |
|
|
|
|
|
| Stockholders' equity |
|
|
|
|
|
| Treasury stock, number of shares held |
|
|
1,797,000,000
|
1,797,000,000
|
|
| Treasury stock acquired, average cost per share (in USD per share) |
|
|
|
$ 67.95
|
|
| Treasury stock, value |
|
|
$ 122,100
|
$ 122,100
|
|
| Remaining stock repurchase amount approved by Board of Directors |
|
|
$ 77,900
|
$ 77,900
|
|