Segment Information (Details) (USD $) | 3 Months Ended |
In Thousands, unless otherwise specified | Jul. 31, 2014 | Jul. 31, 2013 |
| CoreBusinesses |
Segment Information [Abstract] | ' | ' |
Number of core businesses | 3 | ' |
Segment Reporting Information [Line Items] | ' | ' |
Revenue | $437,917 | $411,020 |
Shared services and administration costs | 124,714 | 124,806 |
Operating Income | 49,630 | 35,564 |
Distribution and Operation Services [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Shared services and administration costs | 23,676 | 25,235 |
Technology and Content Management [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Shared services and administration costs | 62,379 | 59,887 |
Finance [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Shared services and administration costs | 13,735 | 12,785 |
Other Administration [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Shared services and administration costs | 25,190 | 24,716 |
Restructuring (Credits) Charge [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Shared services and administration costs | -266 | 2,183 |
Research Communications [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Revenue | 200,714 | 189,114 |
Books and Custom Print Products [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Revenue | 171,565 | 166,842 |
Education Services (Deltak) [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Revenue | 16,236 | 14,700 |
Talent Solutions [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Revenue | 17,176 | 6,587 |
Course Workflow Solutions [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Revenue | 1,314 | 1,096 |
Other [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Revenue | 30,912 | 32,681 |
Operating Segments [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Contribution to Profit | 86,120 | 69,945 |
Segment Reconciling Items [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Shared services and administration costs | -36,490 | -34,381 |
Research [Member] | Operating Segments [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Revenue | 254,870 | 245,788 |
Direct contribution to profit | 113,851 | 110,007 |
Contribution to Profit | 69,851 | 65,749 |
Research [Member] | Operating Segments [Member] | Distribution and Operation Services [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Shared services and administration costs | -11,970 | -11,567 |
Research [Member] | Operating Segments [Member] | Technology and Content Management [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Shared services and administration costs | -25,872 | -26,238 |
Research [Member] | Operating Segments [Member] | Occupancy and Other [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Shared services and administration costs | -6,158 | -6,453 |
Professional Development [Member] | Operating Segments [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Revenue | 92,327 | 84,086 |
Direct contribution to profit | 32,341 | 26,217 |
Contribution to Profit | 7,598 | -1,270 |
Professional Development [Member] | Operating Segments [Member] | Distribution and Operation Services [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Shared services and administration costs | -8,279 | -9,653 |
Professional Development [Member] | Operating Segments [Member] | Technology and Content Management [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Shared services and administration costs | -10,844 | -13,069 |
Professional Development [Member] | Operating Segments [Member] | Occupancy and Other [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Shared services and administration costs | -5,620 | -4,765 |
Education [Member] | Operating Segments [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Revenue | 90,720 | 81,146 |
Direct contribution to profit | 28,152 | 24,146 |
Contribution to Profit | 8,671 | 5,466 |
Education [Member] | Operating Segments [Member] | Distribution and Operation Services [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Shared services and administration costs | -3,319 | -4,041 |
Education [Member] | Operating Segments [Member] | Technology and Content Management [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Shared services and administration costs | -12,987 | -11,637 |
Education [Member] | Operating Segments [Member] | Occupancy and Other [Member] | ' | ' |
Segment Reporting Information [Line Items] | ' | ' |
Shared services and administration costs | ($3,175) | ($3,002) |