Fair Value Measurements - Schedule of Contractual Maturities Available-for-Sale Debt Securities (Detail) $ in Thousands |
Jul. 31, 2015
USD ($)
|
|---|---|
| Fair Value Disclosures [Abstract] | |
| Maturity of one year or less | $ 4,009 |
| Maturity between one and five years | 8,274 |
| Total | $ 12,283 |
| X | ||||||||||
- Definition Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|