Acquisition - Amounts Assigned to Identifiable Intangible Assets and Estimated Weighted Average Useful Lives (Detail) - USD ($) $ in Thousands		3 Months Ended
	Jun. 06, 2014	Jun. 30, 2015
Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated weighted average life (In years)		6 years
Trade name [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated weighted average life (In years)		3 years
NetNearU [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value identifiable intangible assets	$ 24,310
Estimated weighted average life (In years)	8 years
NetNearU [Member] | Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value identifiable intangible assets	$ 10,970
Estimated weighted average life (In years)	7 years
NetNearU [Member] | Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value identifiable intangible assets	$ 10,950
Estimated weighted average life (In years)	9 years
NetNearU [Member] | Non-compete agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value identifiable intangible assets	$ 2,130
Estimated weighted average life (In years)	2 years
NetNearU [Member] | Trade name [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value identifiable intangible assets	$ 260
Estimated weighted average life (In years)	2 years