Tangible and Identifiable Intangible Assets and Liabilities Based on Management's Assessment of Acquisition Date Fair value of Assets Acquired and Liabilities Assumed (Detail) (USD $) In Thousands, unless otherwise specified	May 31, 2014	Feb. 28, 2014		Apr. 30, 2014 Inktank Storage, Inc.
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Estimated identifiable intangible assets (see detail below)				$ 12,900
Cash				27
Accounts receivable				603
Deferred tax assets, net				11,550
Other assets				177
Accrued liabilities				(1,648)
Deferred revenue				(911)
Goodwill	817,279	687,430	[1]	129,845
Total consideration allocated				$ 152,543

[1] Derived from audited financial statements.